Did you read all of it? Scaling to arbitrary device sizes and between input types seems to be a principal consideration here, and my "gut feeling" is it would work.
I can see the animation principles (for instance) being applied from a smartwatch, all the way through 4K displays.
Since most of the points aren't just "declared good" but come with justification, it would be trivial to try to rebuff them, rather than dismiss them with a general argument.
Edit: I'm talking about the spec rather than the actual icons. The icons themselves are scalable as well.
Scaling the vector images is technically doable, but having them look good is another matter. Traditionally a lot of low-sized icons are hand massaged, otherwise due to the scaling you inevitably have most of the boundaries sitting across pixels and everything is quite fuzzy. I found with these that when they dropped sub 128px I was struggling to determine what they were attempting to describe without resorting to the captions. I know that this is less and less of a deal with high resolution displays, but it's still worth considering just how easy to parse an icon is at small size.
I can see the animation principles (for instance) being applied from a smartwatch, all the way through 4K displays.
Since most of the points aren't just "declared good" but come with justification, it would be trivial to try to rebuff them, rather than dismiss them with a general argument.
Edit: I'm talking about the spec rather than the actual icons. The icons themselves are scalable as well.