I was as curious as you were. Turns out there are only so many popular threaded discussion sites in the vein of HN on the Internet, so an educated guess is all it takes.
Without making judgment on the actions of any involved party, I do wonder why the author would choose to bring up this incident and submit it as part of a story to a site where there is a significant overlap in readership.
Well that sucks. It's exactly the site that comes to mind when I think "most popular alternative to HN".
I've generally found conversation there to be more respectful than HN, rather than less, when discussions get heated - so I had high hopes it would be a different site, but alas.
This leaves a really bad taste in my mouth.
Edit: you know what, screw it. In the spirit of "no more self censorship", here's the link: https://lobste.rs/~7u026ne9se
That incident catalyzed the fear that suppressed my desire to participate online for months. I figured that if I couldn't talk about it now, I might never participate again.