Wild speculation that Corinth or any other city had all the information that you have pulled from several disparate verses.
They didn't need it to simply believe what is written:
Every man's work...shall be revealed by fire; v.13
the fire shall try every man's work v.13
If any man's work shall be burned, he shall suffer loss v.15
but he himself shall be saved; yet so as by fire. v.15
1 Corinthians 3 Every man's work shall be made manifest: for the day shall declare it, because it shall be revealed by fire; and the fire shall try every man's work of what sort it is. 14
If any man's work abide which he hath built thereupon, he shall receive a reward. 15 If any man's work shall be burned, he shall suffer loss: but he himself shall be saved; yet so as by fire.
1 Cor.13:2 If I have the gift of prophecy, and know all mysteries and all knowledge; and if I have all faith, so as to remove mountains, but do not have love, I am nothing...
4 Love is patient, love is kind and is not jealous; love does not brag and is not arrogant, 5 does not act unbecomingly; it does not seek its own, is not provoked, does not take into account a wrong suffered, 6 does not rejoice in unrighteousness, but rejoices with the truth; 7 bears all things, believes all things, hopes all things, endures all things.
8 Love never fails; but if there are gifts of prophecy, they will be done away; if there are tongues, they will cease; if there is knowledge, it will be done away. 9 For we know in part and we prophesy in part; 10 but when the perfect comes, the partial will be done away...
13 But now faith, hope, love, abide these three; but the greatest of these is love.
1 Corinthians 15:22 For as in Adam all die, even so in Christ shall all be made alive... 28 And when all things shall be subdued unto him, then shall the Son also himself be subject unto him that put all things under him, that God may be all in all.
https://www.tentmaker.org/books/hope_beyond_hell.pdf