Actually, I think his numbers will probably be pretty friggin' close.
The X360 last year was almost in lock-step with what he said: it was about 210k in Oct, 510k in Nov, 1,150k in Dec.
He's using historical averages, just not 1-2 years, so I am certain that his numebrs include next-gen transition averages (since we're in the first transitioning year, with all 3 consoles available, and vastly more supply than last year).
Seeing the X360 get 2.5m in Nov/Dec would make me giddy :)
Back from the dead, I'm afraid.