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I will go ahead and post my findings:

As of June 3, 2008 it had sold 10 million copies with the 360 version being the most successful.

http://news.cnet.com/8301-13772_3-9959146-52.html?tag=nefd.top

As of May 7, 2009 it had sold 13 million copies.

http://www.gamasutra.com/php-bin/news_index.php?story=23536

Going by VGChartz data:

7,550,316 - 360
4,390,707 - PS3

360/PS3 total = 11,941,023

Thus PC sales are at a max of: 2,058,976 (using 13,999,999 since the breifing said over 13 million)

You can't possibly say that the sales that the company mentioned did not include DD.  I think this pretty much proves the case.