[grey_earthling]

Yes, the form this article discusses is not what I would call a list.

To me, a list consists of bullet points, each of which is no more than 1 sentence. It's not prose as such. I'd also assume that the list might be hierarchically nested.

The article seems to be discussing listicles (or list articles): effectively a series of very short essays that parallel each other, making the same point from a different angle each time, or comparing and contrasting a series of subjects. It's a suitable form if that's the over-all point you're trying to make.

Mainly the article extolls the virtues of organising prose into relatively-short sections, each with a clear heading. I agree this makes prose more readable, but I don't think that's an uncommon opinion.