I have no idea what is his main problem, if it is just about login issue, it can be resolved quickly by contacting support.
Login issue may happen because of several reasons, it can be because our own mistake or it can be an error in the system.
Accusing a site as scam just because login issue without trying to contact support first is questionable.
Base on his post history he also do that claims on other casino so maybe if he's not a total loser which take revenge when he lost he's bets then he maybe a total troll. For sure there's a lot of people here know already how this people work and can check what they have done base on their post history.
So I guess his accusation will be invalid since aside from no proof has been shown his activity make him not credible for his allegation.
Maybe if there's existing problem he can show something to us here and for sure people could verify the issue is true and might he will get an immediate help coming from Betcoin.ag representative since they are also active in this thread.