What? No. I know it's super convenient that he's leaving shortly before the Wii U specs are revealed and that recent rumours have pegged him as likely making it up all along but I swear that this is just a coincidence and it is nothing like the time that GAF poster misled GAF about the Wii specs back in 2006 and saying that it was near an Xbox 360, the people saying that he is are just jealous haters. We LOVE you BG!
To my knowledge BG never ever claimed he was an 'insider', he enjoyed theorizing about what the WiiU could be from a hardware perspective using his knowledge of hardware and having a general idea of the consoles thermal and power envelope.
Even from his first guesses he wasn't far off, he always said it would use a slower clocked CPU, between 1.5 and 2.5GB's of Ram and the GPU would be around the 500 - 700 GFLOP range.
Ideaman (a confirmed poster with 'insider' knowledge) backed many of his suggestions up.
No one will ever be impressed or blown away by the WiiU imo, by the time the big guns are shown off at E3 we will have seen PS4 / 720 launch games.
Even then will Nintendo spend the kind of money that Sony and MS spent on the Uncharted and Gears Trilogies ?, i can't see it myself.
The WiiU will have some fantastic looking first party games but i still think there will be people saying, 'it's nice but it's still not up to the likes of Uncharted 3 / Gears 3' in late 2013.
95% of people will always be more impressed with realistic looking art styles over Nintendo's 'cutesy' art style, it's one of the main reasons i think they never went with a super powerful console on par with PS4 / 720 with WiiU.