I'd send that straight to Itch.io via the Email link they provide in support. Be sure to screenshot/document all of this. I'm sure he's probably running a VPN/TOR combo, and thinks he's untouchable for it, but Itch can still ban the accounts and blackball the associated email accounts. He claims he's not from "my country", but considering he couldn't know where I possibly am with my own VPN/TOR combo, the doxxing thing seems like more of a bluff than anything else... trying to scare you into-- what, exactly? It's all so random and pointless.
As for the cropping: he's posted that screen shot so many times, it's laughable, and I promise you at least one of them will still have his name on it. Even so, I have a screen shot of it already, so he can't really deny it, even with the altered image.
Let him keep digging his own hole.