Apparently, there's a few cards (8?) that disappeared or were deleted from the booru? Kinda curious why (and what those were?), because its rare for this place to delete stuff.
As far as I know, nothing's been deleted from this site based on the image count. If you're talking about the hidden stuff on the first page, it's just bot and discord spam. It's been reported but I think the moderator of this booru is long gone.