well here are some possibilities:
1) ubisoft actually has no idea how much their own game sold or what the platform make-up is. they are willing to pay cash for message board posters to give them this information.
2) ubisoft does know, and whatever private information they have contradicts the information you have.
3) ubisoft does know, and your information is entirely correct, but they have private projections that suggest something different about the economics of rayman legends to justify this decision, whether or not it ends up being correct in the end.
4) ubisoft is deliberately sabotaging their own company in an effort to take down nintendo on behalf of all the third parties of the world who hate nintendo for example nomura is a KNOWN sony fan boy and besides third parties said they wouldn't make games for gamecube because of the low install base but then the wii won and SURPRISE SURPRISE they changed their tune and by the way did you know that all those companies wouldn't have gone bankrupt if they made wii games i hate dudebro shooters for example but call of duty black ops 2 on wii u is a good game and