Yes, I agree, those boom winters happened during our much hotter base state too. Sure, the atmosphere and the oceans have warmed more since 2016, and emissions are rocketing upward, but that doesn't change that we have these recent boom years. They may repeat, or they may not. TBD.
Our average annual snowfall is decreasing. Our average annual temperatures are increasing. The chance of a boom snow year (and individual boom storms) have slightly increased; this slight increase is not enough to make up for our loss of average/marginal events. End result = less average snow over time