Stats are probably not going to ever be server sided for MW2.
Google MW2 config utility, download it, and use its reset system. Note that when you do it, you have to go in game and play a few games so that your new stats will get uploaded to the cloud, because if not, your old stats will just get redownloaded next time the game syncs.
Also, Valve support basically doesnt care about MW2, so dont even bother.