the post showed up on their feed but it was removed from public NEW feed

Yeah, all of them do that. If you go to your user page, all of your posts or comments which were silently deleted are still there. But if you go to the respective pages in question to find them inline with other comments, they’ll be missing.

That’s not shadowbanning. It’s goddamned annoying that we aren’t given a “this post/comment was deleted” notification (we aren’t given one because C knows we would just repost it immediately), but this setup is actually a tiny bit better than full deletion of content because at least YOU can still access it after the fact.