Yeah, perhaps this could be a possibility. And I say this only for a motivation: I have searched about Patcher. He's one of the most respected analysts in his domaine and I found strange that he's done a mistake of 100-120%. It is possible that the Wii has been sold where a gaming system usually don't.
I repeat: if Patcher would not have said that this difference is unexplicable, I would have said:" Nintendo, stop say bullshits. This is what you sold. Nothing more. Nothing less".
And the same about PS2's Software: way too low. Sorry, but there is something wrong.