Noal has been and I have been too. I talked with him about his posts there (under a different name than he uses here) and what he said made sense.
He said that he's posted about some of the newer and/or more obscure Pinns routes on that site so that people that otherwise wouldn't hear of/know of such routes would have a chance to learn of them. Maybe spread the crowds a little further than Bear Gulch.
He makes good posts too - full information in actual English (as opposed to some of the crap there where you wonder if the posting party made it past third grade).
I've posted a few routes there myself so as to retain "control" over the information about that route, so to speak. On Los Banditos, as an example, I posted about it so that some dumb shit wouldn't do the post and f#$k it up. Notice that I've cleverly inserted links to this thread on this site in some of my posts (The Inn Crowd, for example) claiming that I couldn't figure out how to post photos and topos to that site (and actually the claim is true - I couldn't figure it out).
Maybe on all the routes we list there we should insert the words "for a full listing of new Pinnacles routes since the 2007 guidebook, see this thread on the Mudn'Crud Pinnacles site: [link]?" I'd be willing to go back and do that on my entries!