I'm gonna go out on a limb and say no, he can't. All proof he's offered so far only goes back to 2021.

Looks like this account belonged to at least 2 other people before it made its way to OP.

If this account is given to OP, there's always a chance that the original owner could come back & claim it (however unlikely).

I don't know the exact policies that Cryptios employs when it comes to this kind of thing, but I know OP is not the original owner of the account: 3-year posting gap, switch in writing style & subjects, applying for bounties & campaigns for the first time, plus lack of a signature from 1Njf7...