I’ve read several debunkings of Moore’s documentaries and they were all pretty toothless. Most of them pointed out facts which were “left out“ which seem to me to be irrelevant to the points Moore was making. However, I think he did a terrible job on his takedown of Elizabeth Warren, and I wrote a long debunking of that for Daly Kos, which you can read here if you’re interested.

https://www.dailykos.com/stories/2020/1/18/1912413/-The-Sad-Downfall-of-Michael-Moore