Is this your pet opinion? How many scholars would agree that the word aionios in the Greek OT has a different meaning than aionios in the NT?
BTW, my argument re Daniel 12:2-3 was based on the inspired Hebrew OT & the word OLAM, not the Greek LXX word aionios. OLAM is generally translated as aion or aionios in the LXX.
Nothing you have posted and I am certain nothing you could post will refute this entry from BDB.
עוֹלָם S5769, 5865 TWOT1631a GK6409, 6518439 n.m. long duration, antiquity, futurity;—ע׳ Gn 9:12 + 405 times; עֹלָם 3:22 + 19 times; עֵילוֹם 2 Ch 33:7, read prob. עוֹלָם (for other explan. v. note in KitHpt); sf. עֹלָמוֹ Ec 12:5; pl. עוֹלָמִים Is 26:4 + 7 times, עֹלָמִים ψ 145:13 + 2 times; cstr. עוֹלְמֵי Is 45:17;—† 1. of past time: a. ancient time: יְמֵי ע׳ days of old Is 63:9, 11 Am 9:11 Mi 5:1; 7:14 Mal 3:4; יְמוֹת ע׳ Dt 32:7; עַם ע׳ Is 44:7 ancient people; גּוֹי מֵע׳ Je 5:15; חָרְבוֹת ע׳ old waste places Is 58:12 61:4, cf. Ez 26:20 b; פִּתְחֵי ע׳ ancient gates ψ 24:7, 9; ארח ע׳ Jb 22:15; נתבות ע׳ Je 6:16; שְׁבִילֵי ע׳ 18:15; גבול ע׳ Pr 22:28; 23:10; במות ע׳ Ez 36:2; מִן (םֵ)ע׳ from of old Is 64:3 Je 2:20 Jo 2:2, of the fathers Jos 24:2, the prophets Je 28:8, the ancient נפלים Gn 6:4; (Ez 32:27 G Co for מערלים; but 1 S 27:8 read מִטֵּלָם for מעולם We Dr HPS); בהם ע׳ long in them Is 64:4 (text dub.). b. מֵתֵי ע׳ the long dead ψ 143:3 La 3:6; so עַם ע׳ Ez 26:20. c. of God, מֵע׳: former acts Is 46:9; as redeemer Is 63:16; of love ψ 25:6, judgment 119:52, dominion Is 63:19; long silence 42:14; 57:11 G B Michaelis conj. מַעְלִם for מֵעוֹלָם; cf. I. [עָלַם] Hiph. ψ 10:1; his wisdom personif. Pr 8:23; his existence ψ 93:2. d. of things: גבעות ע׳ ancient hills Gn 49:26 (J), Hb 3:6 (|| הררי־עד), Dt 33:15 (|| הררי קדם). e. pl. שְׁנוֹת עולמים ψ 77:6 years of ancient times; דורות עולמים Is 51:9; לעלמים Ec 1:10 in olden times. 2. a. indef. futuring, c. prep. for ever, always (sometimes = during the lifetime); עֶבֶד עולם slave for ever Dt 15:17 1 S 27:12 Jb 40:28; עָבַד לע׳ serve for ever Ex 21:6 (E), Lv 25:46; עד ע׳ 1 S 1:22; גְּאֻלַּת ע׳ Lv 25:32 redemption at any time; הֲרַת ע׳ Je 20:17 ever pregnant (womb); כְּלִמַּת ע׳ v 11 of persecutors of Jeremiah; חרפת ע׳ 23:40; שַׁלְוֵי ע׳ ψ 73:12 alway at ease; יְחִי לע׳ (יחיה) may the king live alway 1 K 1:31 Ne 2:3; cf. אֹרֶךְ יָמִים עולם ועד ψ 21:5; ישׁב עולם לפני אלהים 61:8; so of the pious, לע׳ לא ימוט 15:5; בל ימוט Pr 10:30, cf. ψ 30:7; other phr.: ψ 37:27, 28 41:13; 55:23; 61:8; 73:26; 121:8 Pr 10:25; ע׳ אשׁירה ψ 89:2 I will sing for ever (as long as I live), cf. 52:10; 115:18; 145:1, 2; הוֹדה לע׳ 30:13; 44:9; 52:11; 79:13; other emotions and activities continuous through life 5:12; 31:2 = 71:1, 75:10; 86:12; 119:44, 93, 98, 111, 112 Mi 4:5, cf. לע׳ 2:9. b. = continuous existence, (1) of things: the earth, הָאָרֶץ לְעוֹלָם עֹמֶדֶת Ec 1:4; other phr.: ψ 78:69; 104:5, heavens and contents 148:6, ruined cities Is 25:2; 32:14 Ez 26:21; 27:36; 28:19, ruined lands Je 18:16; 25:9, 12; 49:13, 33; 51:26, 62 Ez 35:9 Zp 2:9; לעד עד ע׳ Is 30:8 for a witness for ever, in a book; (2) of nations: לעולם אהיה 47:7 (Babylon loqu.), cf. ψ 81:16 Ob 10; ישׁב לע׳ of Judah Jo 4:20; (3) families ψ 49:12 Is 14:20; the dynasty of Saul 1 S 13:13; house of Eli 2:30; (4) national relations: איבת ע׳ continual enmity Ez 25:15; 35:5; of exclusion from קהל י׳, עד ע׳ Dt 23:4 = Ne 13:1; various relations Is 32:17; 34:10; חרפת ע׳ perpetual reproach ψ 78:66, of dynasty of David 2 S 3:28; 12:10 1 K 2:33, families v 33 2 K 5:27 ψ 106:31 Je 35:6. c. of divine existence: אל עולם Gn 21:33 (J); אלהי ע׳ Is 40:28; חי אנכי לע׳ Dt 32:40; חֵי הע׳ Dn 12:7; of divine name, זה שׁמי לְע׳ Ex 3:15 (E), cf. 2 Ch 33:7 (v. supr.); blessing and praise of it 2 S 7:26 = 1 Ch 17:24, ψ 72:19; 135:13; of י׳ himself89:53; attributes, אהבה Je 31:3 1 K 10:9; חסד Is 54:8 ψ 89:2; 138:8; לע׳ חַסְדּוֹ 1 Ch 16:34, 41 2 Ch 5:13; 7:3, 6; 20:21 Ezr 3:11 ψ 100:5; 106:1; 107:1; 118:1, 2, 3, 4, 29; 136:1 + 25 times, Je 33:11; כבוד ψ 104:31; אמת 117:2; 146:6; צדק 119:142; עצה 33:11; reign Ex 15:18 (E), ψ 10:16; 66:7; 92:9; 146:10 Je 10:10 Mi 4:7; יהוה לע׳ ישׁב ψ 9:8; 29:10; 102:13 La 5:19; presence in Zion 1 Ch 23:25 Is 33:14; 60:19, 20 Ez 37:28; 43:7, 9; his salvation Is 51:6, 8; זרעת ע׳ Dt 33:27 everlasting arms; כל אשׁר יעשׂה האלהים יהיה לע׳ Ec 3:14. d. of God’s covenant: בְּרִית ע׳ everlasting covenant Gn 9:16; 17:7, 13, 19 Ex 31:16 Lv 24:8 Nu 18:19 (all P), 2 S 23:5 1 Ch 16:17 = ψ 105:10, Is 24:5; 55:3; 61:8 Je 32:40; 50:5 Ez 16:60; 37:26; covenant with Noah, לְדֹרֹת ע׳ Gn 9:12 (P); God remembers it 1 Ch 16:15 = ψ 105:8, ψ 111:5; will not break it, לע׳ Ju 2:1; אוֹת ע׳ Ex 31:17 (P); אוֹת עד ע׳ Dt 28:46. e. of God’s laws: דבר(ים) Is 59:21 ψ 119:89; משׁפט 119:160; עדות v 144, 152; חק ע׳ Ex 29:28; 30:21 (E), Lv 6:11, 15; 7:34; 10:15; 24:9 Nu 18:8, 11, 19 (P), also Je 5:22 (of bounds of sea); חק עד ע׳ Ex 12:24 (J), חֻקַּת ע׳ v 14, 17; 27:21; 28:43; 29:9 Lv 3:17; 7:36; 10:9; 16:29, 31, 34; 17:7; 23:14, 21, 31, 41; 24:3, 8 Nu 10:8; 15:15; 18:23; 19:10, 21 (P) (most of these in fact specif. Jewish and temporary); temple to bear God’s name, עד ע׳ 1 K 9:3 = 2 Ch 7:16; לע׳ 2 K 21:7 2 Ch 33:4; consecrated לע׳ 30:8; its ceremonies לע׳ 2:3; Levit. priesthood, לשׁרתו עד ע׳ 1 Ch 15:2; Aaronic priesthood, לברך בשׁמי עד ע׳ 23:13(×2). f. of God’s promises: his word, יקום לע׳ Is 40:8; promised dynasty of David, עד (ה)ע׳ 2 S 7:13, 16(×2), 25 = 1 Ch 17:12, 14(×2), 23 ψ 18:51 = 2 S 22:51, 1 K 2:33, 45 1 Ch 22:10 ψ 89:5; לע׳ 1 K 9:5 1 Ch 28:4, 7 2 Ch 13:5 ψ 89:29, 37 2 S 7:29(×2) = 1 Ch 17:27(×2); of holy land 1 Ch 28:8, אֲחֻזַּת ע׳ Gn 17:8; 48:4 Lv 25:34 (P); given לע׳ Ex 32:13 (J) 2 Ch 20:7; עד ע׳ Gn 13:15, inherited לע׳ Is 60:21 ψ 37:18; עד ע׳ Is 34:17; dwelt in עד ע׳ Ez 37:25; other blessings, לע׳ Dt 5:29 Ho 2:21; עד ע׳ Dt 12:28 2 S 7:24 = 1 Ch 17:22, ψ 133:3; שִׂמְחַת ע׳ Is 35:10; 51:11; 61:7; דֶּרֶךְ ע׳ ψ 139:24; שׁם ע׳ Is 56:5; 63:12; אות ע׳ 55:13; גאון ע׳ 60:15; Jerus. to abide לע׳ Je 17:25 ψ 125:1, cf. Je 31:40; עד ע׳ ψ 48:9. g. of relations between God and his people, לע׳ 1 Ch 29:18 ψ 45:18; 85:6; 103:9; 145:21 Is 57:16 Je 3:5, 12 La 3:31 Jo 2:26, 27; עד (ה)ע׳ ψ 28:9 Mal 1:4. h. of Messianic dynasty and king: (ל)ע׳ ψ 110:4; having divine throne 45:7; name endures 72:17; established 89:38; God blesses him 45:3; of his reign, מעתה ועד ע׳ Is 9:6. i. = indefinite, unending future: live לע׳ Gn 3:22 Jb 7:16; הנביאים הלע׳ יִחְיוּ Zc 1:5 the prophets, can they live for ever? cf. חדל לע׳ ψ 49:9; c. neg. never Ezr 9:12 Pr 27:24. j. after death: שׁנת ע׳ Je 51:39, 57; בית ע׳ Ec 12:5; חַיֵּי ע׳ Dn 12:2; דראון ע׳ v 2; also v 3 Jon 2:7 Ec 2:16; 9:6. k. = age (duration) of the world: את העלם נתן בְּלִבָּם Ec 3:11 the age of the world he hath set, etc. (cf. especially NH; others i). 1. pl. intens. everlastingness, eternity: תשׁועת עולמים Is 45:17; צדק עלמים Dn 9:24; צור עולמים Is 26:4 (RVm rock of ages); מלכוּת כל עלמים ψ 145:13; also 61:5; 77:8 1 K 8:13 = 2 Ch 6:2. m. special phr.: ם(ה)עולם (ו)עד (ה)עולם (מן) from everlasting to everlasting, of י׳ ψ 90:2, חסד י׳ 103:17; benedictions 1 Ch 16:36 = ψ 106:48, Ne 9:5 1 Ch 29:10 ψ 41:14; the land given למן עולם ועד עולם Je 7:7; 25:5; מעתה ועד עולם from now and for ever ψ 115:18; 121:8 (i.e. as long as one lives); of people’s hope in God 131:3; dynasty of David Is 9:6; of God’s acts, words, etc. Mi 4:7 Is 59:21 ψ 125:2, cf. 113:2;—v. further i. עַד p. 723.
Brown, Francis ; Driver, Samuel Rolles ; Briggs, Charles Augustus:[BDB] Enhanced Brown-Driver-Briggs Hebrew and English Lexicon. electronic ed. Oak Harbor, WA : Logos Research Systems, 2000, S. 761