The article missed an important point, namely that arguing for that C isn't a low level language is entirely pointless if you can't argue for one that can described as such. But this article just makes a point about how there are actions performed on a CPU which you have no control over. Feels like a clickbait title to me.
Yeah, one of those all-too-common articles with a title that's a vast over-generalization or over-simplification. Then it turns out it's trying to make a very narrow point that kind of sort of resembled the generalization but is really just some variety of nit picking or hair splitting.