A fair comparison to the WII U Launch

[JWeinCom]

ninjablade said:

I see people comparing the WII U launch to ps2, wii, 360 and ps3, three of those systems were sold out for months, ps3 was kinda of in supply constraint but was just too expensive for the general public to spend on a system, now lets look at the gamecube and xbox launches numbers, now we know nintendo was gearing up  for a huge launch but there just isn't  any demand for the wii u.

 

November 2001
Xbox: 711,619
Gamecube: 647,466

December 2001
Xbox: 690,817
Gamecube: 558,200

So the Life-to-date totals, all of them covering very close to the same number of days, are:
Xbox: 1.4 million
Gamecube: 1.2 million
Wii U: 885k

Where are these numbers from?  These don't look right.