If you're going to say that something someone did was wrong, you need to prove it.
And that is your proof? The fact that VGChartz sold-through is 70M lower than the shipments? I mean, that's a minor mistake. The errors there will inflict a fair bit, but it's less than what one could easily expect. We knew it was as inaccurate as this, in fact, your "proof" makes VGChartz seem more accurate than I thought it was.
Edit: ah, no Wii Sports you say? Mind giving me a link? Anyway, that would put it closer to my beliefs.