Notice that it has avatar/signature of some ICO crap, it was most likely bought by some bounty hunter, the hacker probably didn't realize that he got a valuable account. The harm could be much higher, they could change their ann thread to redirect people to fake copy of yabtcl.com and steal incoming deposits.
Ok, this really looks like a reason to tag him.
It's kinda strange that the account suddenly went silent, maybe it was banned? Can someone check this?
I checked on LoyceV tool
http://loyce.club/bans/usernames.txt but couldn't find him. That account is, according to Loyce data, not banned.
Edit: I tagged him and put a message so he can PM me in case he ever recovers his account.