Several members called him out during this time and there was several topics about him in Reputation, but he never replied anything as far as I know.
He was obviously trying to stay under the radar here, while pretending to be angry old owner in russian local board.
Him not arguing anymore was more about realizing that the more he wrote, the worse his situation was as he coulnd't control his emotions, so better stay quiet than dig hole even deeper. At least that's how I see it.
However, I don't think he is gone for good, he probably uses some different account now, maybe someone recognizes his writing style in future.
It would take a shit load of effort for someone like him to stay hidden.