https://news.ycombinator.com/newsguidelines.html
Edit: I got this wrong—this article was produced by one of those organizations. Please see below.
The New York Times is guilty of the same. Each of the articles mentions that this is a collaboration with other publications, but doesn't link to the other ones. There's not really a single original source.
Edit: ok, I've merged the comments back into https://news.ycombinator.com/item?id=20335816 and made this one the dupe instead. Thanks for watching out for the quality of HN! Especially when we screwed up.