i stand corrected 
but even so they should say it works with a pc...stupid not to
It is a stick being released for a specific game that is only on 360, and though it probably works on the PC, it does not include drivers or support, so it would actually be stupid
to mention it.
Plug it into the 360 it will work perfectly. Plug it into a PC, and any number of things could be an issue, meaning more tech support, meaning more money.
Creative people that want it on the PC, will get it on the PC. No need to advertise it.