I don't want to speak for Mad Hungarian, but I'm confident he would not say any single tire is "the best winter tire, period". It doesn't work that way.
I've had plenty of winter tires with more snow/ice drip than my Pirelli Sottozero 2's but unless you were on roads that were covered in snow/ice, those winter tires were terrible tires. The Sottozero's perform more than adequately when actively driving on roads covered in snow/ice and continue to perform when there is pavement peeking through.
They are, as close as I can tell, the same loudness as the OEM Michelin MXM4 Primacy's and have better cornering on bare pavement because they have a much more predictable release. The Primacy's grip just as well on most cold weather pavement, wet or dry, but cut loose unpredictably when they lose grip. This makes the Sottozero 2's a much more fun tire than typical winter tires and even better than the Michelins on bare pavement. I only compare the winter Sottozero's to the all season Primacy's to illustrate that not all winter tires have to suck when you're not on snow/ice.
Granted, I have them on an AWD. If it was for the RWD, and I needed to climb the same steep hills in the same severe winter storms, I might reluctantly consider a more winter orientated tire. But the superior electronic stability and traction controls of the Model 3 make the Sottozero's perform more than adequately on my AWD P3D. Are they "the best winter tire", of course not, there is no such thing.