Personally, I would remove "member" Songwronger from mudcat and stop all his posts.
This is not likely with the present setup.

Don Firth suggests challenging these insane posts and responding with sensible argument. I have sometimes done this as I have here, mostly reflexive action on my part, but only mental incompetents would believe his posts.

Mudcat regulators, the only way to stop his garbage is to ban him from posting, and careful elimination of "guest' posts from others of his ilk.