This IS NOT a roster update. I just loaded it onto my xbox to verify it. Its a roster in which all of the players have been edited to either 0 or 99. And if you save it to your hard drive, the file name is roster1, so it'll wind up saving over your default roster, if that is what you have it named.
My only question is why anyone would take the amount of time to change all those ratings for hundreds of players just to post it on the net... thats sad.