That's the only problem it seems he doesn't have Bitcoin address stake there or even other threads.
Most of his posted addresses are ETH unless if he can prove that he owns this address: 0x0B4B0867f86a16002Fe5a4Db770B3EE35FAfD86A
Which is posted around 2018.
The thing is does forum recognize the eth signing as proof of ownership here or only bitcoin sign message only?
I think I saw a thread before of eth sign message as proof of ownership. Hopefully it can be used since some here are possibly have eth instead of bitcoin due to bounty and airdrops.