I thought I had seen the limits of the absurdity of this "footnote style" hyperlinks in HN. Now I'm certain of it.
It would be highly pretentious, I think you agree, if it were a normative standard. That's not the case, so it seems they got carried away in trying to be witty
These are comments on some web resource, not research papers.
I guess there's no accounting for taste.
(Or, perhaps meta:
I'd much rather read [1] than [2]. Too much bouncing around; I'm not even sure if it's worse when the text is large compared to the research paper citations, or small.