Yep, he will most likely get banned but if he was indeed hacked I don't think that it will be that hard to convince mods to unban him. Keep in mind that we are not talking about some unknown low level account but about Legendary with good reputation and history on bitcointalk so it doesn't make any sense to post some low level garbage like this. And it's not like we see something like this before as there were exactly the same cases in the past and members got their accounts back.
I like seeing getting unbanned in this forum at times as a game of roulette
offordscott for example had his account banned for posting malware. It was quite clear that it was hacked. He
appealed against the ban and had even some trusted members vouch for him, but in the end the account remained banned. He probably gave up on the forum after that.