This is a rule violation, but it's fairly minor. A veteran forum member isn't typically going to be banned without warning for moving their topics incorrectly.
But has he received any warning about it? It seems to many of us too many threads with significant discussion and merit in them to do so without further explanation, which he has not given.
Although I suppose if he hasn't received a warning, your post, which he is sure to read, serves as a warning itself.
He received a warning from me. I wrote to him about his behavior and that in case he continues such actions, he will get a ban. I did not receive a reply, but his trash topics did no longer appear after my warning. I hope for his discretion.