As the Earth's average temperature increases, the amount of snow occurring, planetwide, throughout the year, will decrease. This can be offset by increases in precipitation in colder areas, like Antarctica and high altitude regions. I haven't bothered to read the prediction you're talking about. It would be pretty irrelevant. But deniers jump on it as they love to do. As they're driven to do, since they can't argue the actual science.
The world is getting warmer. The primary cause is the greenhouse effect acting on human GHG emissions. These points have become simply irrefutable.
Yeah, that's what viner claimed back in the early 90's. He was catastrophically wrong. As are you.