Yes, it does. I began studying the matter of ECT long ago, so I am well aware of what "aionios" means. You seem a bit fuzzy on it, so let me offer the following:
"The predominant meaning of aionios, that in which it is used everywhere in the N.T., save the places noted above (Eph. 3:11; 1 Tim. 1:17; Ro. 16:25, 26; 2 Tim. 1:9; Tit. 1:2) may be seen in 2 Corinthians 4:18 (18 while we do not look at the things which are seen, but at the things which are not seen. For the things which are seen are temporary, but the things which are not seen are eternal.) where it is set in contrast with proskairos, lit., 'for a season,' and in Philemon 15 (15 For perhaps he departed for a while for this purpose, that you might receive him forever), where only in the N.T. it is used without a noun. Moreover it is used of persons and things which are in their nature endless, as, e.g., of God, Rom. 16:26; of His power, 1 Tim. 6:16; and of His glory, 1 Pe. 5:10; of the Holy Spirit, He. 9:14; of the redemption effected by Christ, He. 9:12, and of the consequent salvation of men, He. 5:9..." (pg. 43, Vine's Expository Dictionary of Old and New Testament Words).
It matters not one whit to the question of ECT whether or not scientists believe in anything eternal. As you can see in the quotation above, the Bible indicates a number of things are eternal. Is an eternal God "a theory that came and went"? I don't think so...
Jesus being the Alpha and Omega does not imply an end to everything but rather the eternal nature of Christ and his sovereign supremacy over all things.
God's years have no end, not because the word eon-ian (aionios) is attached to God, but because, for example, the Bible tells us His years have no end (Psalm 102:27).
God is the God of this present eon which shall come to an end. Does that mean God ends. Obviously not. No more than a person comes to an end when their childhood or teenage years end. Likewise God being eon-ian does not mean He ends or that eonian means eternal. It's simple irrefutable logic.
God as eon-ian (KJV eternal) does not mean endless here:
"Adolph Deissman gives this account: "Upon a lead tablet found in the Necropolis at Adrumetum in the Roman province of Africa, near Carthage, the following inscription, belonging to the early third century, is scratched in Greek: 'I am adjuring Thee, the great God, the eonian, and more than eonian (epaionion) and almighty...' If by eonian, endless time were meant, then what could be more than endless time?" "
Chapter Nine
Even eon-ian (aionios) life is said to have an end, proving it need not mean eternal:
"But even the aiónes will come to an end, Origen tells us: “After aiónios life a leap will take place and all will pass from the aeons to the Father, who is beyond aiónios life. For Christ is Life, but the Father, who is ‘greater than Christ,’ is greater than life” (Comm. in Io 13.3; quoted in Ramelli, p. 160). The Father transcends all ages. In the apokatastasis the entirety of creation will participate in the aḯdios life that is the Creator. God will be all in all (1 Cor 15:24-28). The Origenian notion of eschatological stages sounds strange to our ears today. When was the last time you heard a sermon on the Son delivering his kingdom to the Father in cosmic theosis? Origen’s exegesis should at least challenge our default readings of aiónios and the Eschaton. By contrast, the fire that belongs to the world to come, the pur aiónion, most definitely will come to an end. It may last for a long time, but it is not eternal. Evil has no place in the universal restoration. Konstan and Ramelli elaborate:
Sometimes Eternal Isn’t Forever
"In Origen, the adjective aïdios occurs much less frequently than aiônios, and when it is used, it is almost always in reference to God or His attributes; it presumably means “eternal” in the strict sense of limitless in time or beyond time."
Konstan and Ramelli 6: Aiônios and aïdios in Origen (Guest post, part 6)
We have endless life not because of the word eon-ian, but from immortality & incorruption.
God is not an eternal sadist.
"Many suppose that eonian must denote endlessness when describing God, as in Romans 16:26- "the eonian God." (King James wrongly makes this, "the everlasting God.") No. It’s another overreaction."
"This verse isn’t trying to tell anyone that God lives forever. Everyone already knows God lives forever. Psalm 102:27 testified long ago that "His years shall have no end." It’s old news. The vital question is: Does God sit on high, removed from our struggles in time, or does He care what happens during the eons? He cares. Thus, He is the eonian God. This does not limit Him to the eons any more than "the God of Abraham, Isaac and Jacob" limits Him to those patriarchs."
Eonion Life, Not Eternal Life
“For I am the Lord, I do not change;" Malachi 3:6
God is love.