Everyone knows that Satoshi owns many Bitcoins. If Satoshi wants to prove that he is, he can transfer all these Bitcoins to a wallet where he will create it and then redistribute it. I guess that could convince us all.
After all, this is resolved to be Satoshi, he can tell us what he wants about these issues. Let's think about endgame when those times come.
He should have done it in the first place to prove to all of us that he is the real creator but most of his stance are purely drama.
I also have the same question as OP because I don't see any benefits from being Satoshi unless you just wants publicity and fame.