I have the same issue. I have a set of 4 Blizzak studless ice and snow tires mounted on a 2nd set of OEM rims, which I'll mount on my CTS4 before heading out to the mountains in the winter. These rims don't have TPMS sensors mounted on them, so the warning message comes on when I have these tires and rims on the car.
While I haven't found how to disable the light, I've found that if you use the DIC up or down buttons that it will clear the message off of the DIC and allow you to select whatever information you want displayed. You'll need to do this every time you start up the car. Still annoying, but at least you don't have to look at the the warning message all of the time.