... the person have been banned for some reason.
I'm not familiar with the specific "nick", and while I could check up on it, it is not custom for us to discuss banning with non-involve people, in which case I would not disclose such information.
Often a banning are "public", however some violations do require us to delete and/or modify posts, which makes it less clear to the "public" why a person might have been banned. Some accounts get banned for advertisements, or linking to pornographic sites, piracy sites and so on - and it is custom for us to delete such threads.
And it could be the case with the account in question, but as said - we rarely discuss the specifics of a particular banning outside moderator/Buck.