If I remember correctly, Valve stated that for being "Steam certified" the controller needs to have capacitive joysticks to regulate the gyro, similar to the "Horipad" that they partnered to release.

I was hoping that 8bitdo would launch a controller that actually has this because it makes gyro much more viable, to the point that I really don't like using gyro without that.

But this announcement is just to indicate explicit compatibility for steam input (which has been available in the beta for a while, btw). I don't think this is a huge change since technically they were compatible before too.. even if it was through the xinput / dinput interface without being recognized as 8bitdo.