Well, first of all, offering all that stuff is highly illegal, but besides that, anyone who actually works for an authorized Nintendo developer can tell you that all of Nintendo's documents are shit and loaded with inaccuracies - and more importantly, lack pretty much all information that would be remotely useful for accurate emulation of the console. Additionally, the MAME and MESS teams are made up of people who have been around the emulation community for well over a decade in most places, so we have pretty much every single document that you're ever going to come across, and some that you probably won't.