Something big is happening, as Reddit seems to have purged literally every NSFW sub they know. Reason is always "unmoderated" despite some of the banned subreddits being fully moderated.
Edit: seems to have been a bug in automation (thanks @lefty7283@lemmy.world):
https://old.reddit.com/r/ModSupport/comments/1ii67mt/_/mb3fewv
It's still a good reminder on how quickly a community (or communities) thousands of people enjoy and in some cases rely upon can disappear.
It probably just looks for subreddits with a lot of NSFW flagged posts and they got the parameters wrong for what triggers the "is this unmoderated" part. Unmoderated NSFW subreddits probably are the target of this tool. Just my guess based on the context.