Feels spooky. Ancient Bitcointalk accounts are starting to log in. Do you think this is connected to a forum breach?
There's nothing spooky about it. If their passwords have not been changed since the data breach in 2015, then there's always a chance that they will get compromised.
No, that website has nothing to do with BTCT except that it stole all of the data created by its users. If you log in there, there's a decent chance that your account will be compromised.
maybe its just admins ?

No.