Mega Man 9 demo, PS3: 63 MB -Mega Man 9 demo, Xbox 360: 88.7 MB -Mega Man 9 game, Wii: 8.3 MB
Of course, he does account for that. He was following their discovery chronologically rather than a more straightforward story. First they downloaded the game and timed it, got some odd results, looked further, and realized the difference in sizes.
Such a discovery calls for some long division, which yielded the following results:
-Mega Man 9 download speed on PS3: .44 MB per second (1st place)
-Mega Man 9 download speed on Xbox 360: .26 MB per second (3rd place)
-Mega Man 9 download speed on Wii: .31 MB per second (2nd place)
It doesn't matter that the file sizes were different, that was accounted for.
Furthermore, all three systems appear to have been tested on each connection, not a PS3 on one connection, a 360 at another house, etc.
Lastly the blog calls for more results. The most valid criticism of the findings is not the methodology but the low numbers, and the author appears to acknowledge that and is trying to do something about that.
But by all means, heap abuse on him for daring to try to compare consoles quantitatively.