That seems to corroborate what he's talking about. I'm inclined to think it's pretty legit info. I think John Hearne is actually a member here.
MIM seems all right for some stuff--like hammers, triggers and certain levers. But something like a locking insert... I dunno. Seems to me that a part which takes that much stress should be a machined part--if you're serious about the gun it's going into.
I'd love to see all the things you mentioned come back to the P2XX series. Even if they sold a plain jane P226 for $1200... I'd rather have real QC, machined parts, etc. than fancy add-ons and G10 grips.