I think this is just a misunderstanding that will surely be cleared up after contact with support.
I honestly absolutely do not think devans banned him for a single statement in chat. Many portals would have no users left in no time. Such statements or curses and insults are actually read daily in the chat boxes.
What is the actual reason is also certainly not a topic that is discussed or should be discussed here in the forum, we showed him how he can contact devans directly, this should be enough to get the problem Adressen and maybe even solved.