Given the amount of people who are constantly waiting for Hyperion to do anything wrong so they can kick up a fuss, can you blame them for covering themselves like this?
Just about any computer company would say the same thing - "please don't fiddle with our systems, but if you do you're on your own".
I think they didn't say anything unusual for a company.
Don`t see why so much controversy. If owner is willing to open the case (and loose the guaranty like everywhere), remove Radeon HD and one PCI card and put Radeon 9250 it will work. But he has been properly warned.