I think I came across a tweet on this few days ago too. And to the best of my knowledge, based on the little piece I read about his interview with another site, he stated that he was leveraging AI to downsize his editorial team, thereby cutting down his expenses whilst still maintaining the same level of effectiveness and quality. So, I really don't think that he was being banned for overusing the AI, that's if he's being honest, lol.
But what I have seen is, he's probably snagging up old domains with authorities and re-purposing them for mass production and publication of content in entirely different niches, which could have been the major reason for the ad network banning him.