Yea, I agree that by itself the aionios is a weaker proof. However, if you take a good comprehensive look at “olam” you will see that forever is weak also. Of course we would have to make posts that far exceed the practical limits of the forum to go in depth into all of the OT verses that also lean into the restoration of all things, and thoroughly look at “olam”, so these points are merely signposts that will hopefully attract your attention as you walk on in the word.
For instance in this portion of Isaiah there is a testimony far clearer than any OT reference to eternal torment, because there is no clear OT reference to eternal torment.
On this mountain the Lord Almighty will prepare
a feast of rich food for all peoples,
a banquet of aged wine—
the best of meats and the finest of wines.
7
On this mountain he will destroy
the shroud that enfolds all peoples,
the sheet that covers all nations;
8
he will swallow up death forever.
The Sovereign Lord will wipe away the tears
from all faces;
he will remove his people’s disgrace
from all the earth.
The Lord has spoken. Isaiah 25.
God will remove the shroud(2 Cor 4:3-6) from all people and remove the reproach of His chosen people. Paul parallels this in Ro 11(among other places)
I do not want you to be ignorant of this mystery, brothers and sisters, so that you may not be conceited: Israel has experienced a hardening in part until the full number of the Gentiles has come in, and in this way all Israel will be saved…
For God has bound everyone over to disobedience so that he may have mercy on them all
Oh, the depth of the riches of the wisdom and knowledge of God!
How unsearchable his judgments,
and his paths beyond tracing out!
“Who has known the mind of the Lord?
Or who has been his counselor?”
“Who has ever given to God,
that God should repay them?”
For from him and through him and for him are all things.
To him be the glory forever! Amen. Romans 11:35-36
Most people who say there are more verses pointing to eternal torment are (imo) reading with that presupposition, until they begin to seriously consider the possibility that Jesus meant what He said when he testified,
“If I am lifted up I will draw all men unto me” Jn 12:32
and
He who was seated on the throne said, “Behold, I am making all things new, Write these words, for they are faithful and true.” Rev 21:5
In 1 Cor 15 23-28 and Phil 2:9-11, we see that the exaltation of Jesus over all leads to God becoming all in all. And in many, many other verses OT and NT, once the presupposition is removed, there is at the very least a clear possiblility for an honest interpretation that God will not destroy, or eternally torment most of His creation.
I consider that our present sufferings are not worth comparing with the glory that will be revealed in us. For the creation waits in eager expectation for the children of God to be revealed.For the creation was subjected to frustration, not by its own choice, but by the will of the one who subjected it, in hope that the creation itself will be liberated from its bondage to decay and brought into the freedom and glory of the children of God.Ro 8:18-21