To be clear, Markcjr was asking about dual compound winter tires. The link you provided didn't confirm those Nokian were dual compound, only that they had a built in tread wear indicator that would indicate when tread depth was too low to reliably prevent hydroplaning in winter slush. They may or may not be dual compound and the link you provided does nothing to answer that question. But your point about paying attention to the specific model is a good one. A tire is much more than a brand name.
In any case, I avoid dual compound winter tires. Sometimes I'm ready to toss the tires when they are half worn, but other times I want to get another 2 or three months use out of them and this is not possible if the winter rubber has worn away. A modern winter tire absolutely depends upon the rubber compound for its performance. An all-weather tire is a huge compromise in this important feature.