One of the quirks of HN (and a good one IMO most of the time) is that people tend to reply to the title and not the source. I didn’t even realize the source of the article before you mentioned it.
Because it short circuits the tendency to only allow articles from “the right kind” of sites. It also opens up conversation on topics tangentially related to the link, but not directly about it - which end up being the best comments more often than not.