I verified my ETH address in a matter of minutes. The dev is often available on Discord and will give you a message to sign with your address.
You don't risk anything by doing this so it's a no brainer.

I think I'll also burn my tokens for the third swap. This option is open until the end of May. Even if the old dev return miraculously he can't be trusted so I see no value in holding PoS any longer.