It strikes me as being kind of like a horoscope - you can apply some bits of it to almost any political movement, but it doesn't really fit anything 100%. Which means it's therefore useless.
I’ll contend your shallow dismissal. This is not a list of all possible sociopolitical properties a political movement may have, which is what you seem to be describing. It’s a list of the ones that, found together, characterize a particular political movement as being Ur-Facist.
Consider things further. As with any other data or observation you're correct in that any one single point isn't useful to declare a trend. This list isn't an "or" conditional. Eco doesn't mean that meeting any single point is sufficient. It's when you can go through the list and check a bunch of these boxes, or at least a couple that are much stronger indicators than some others, like "disagreement is treason". And of course it's a spectrum, not a binary yes/no.
You're not going to get a formulaic assessment that is a perfect indicator of any major social or political trend of this sort. To go back to horoscopes, they are successful because they throw a bunch of things at the wall but get people to focus on only the one piece that's correct. In the case of this list, you need multiple hits, and