Great work! Yeah, I was considering to check his posts in an attempt to "forgive" him, but noticed that some posts look too well structured to be written by him. There was quite a difference between some of his posts and I guessed it was something fishy, and it's likely that it wasn't AI this time, but plagiarism, which you already found. He should have been banned since the first offence, but he wasn't. I'm hoping he ends up banned this time, because plagiarism is something that is against the rules of the forum.