Forza 3 sells two million. Overtracked?

[Rainbird]

According to VGC numbers, Forza 3 is at 2.39 million sold to consumers.

http://www.vgchartz.com/games/game.php?id=30434&region=All

But according to this article, Microsoft and Turn 10 are now celebrating that the game sold more than 2 million.

So, is it overtracked?