I've been here a long time, and, uh, what? I don't know if OP's comment in particular is a good one, but I don't think there's a problem in general with adding a little HN-specific commentary.
(Anyway, I checked the github profile in OP and didn't see any plausible candidates for the link, so either it's private or deleted (or never existed, but that seems less likely).)
https://news.ycombinator.com/threads?id=kauai1
I am getting the feeling that in the last two years Hacker News has attracted a lot of people who are trying to use the community like Product Hunt and who don't participate, write comments, upvote things, etc. Thus you see so many people who post links to their blog over and over again and either don't realize they are getting flagged right away or post about how mystified they are about this.
I am not the one flagging this sort of comment but a lot of people are doing it very quickly, it might even be automated. Part of it is that people tend to automatically assume that any kind of summary is just more AI slop. Who knows if it is, but it behooves you this summer to stop behaviors that contribute tot his perception.
Maybe literally any of the other yellow-to-red flags about their behavior? I mean, yeah, if you only post about your own stuff, don't expect HN to treat you kindly, but that wasn't what you initially responded to. And by the way, I've seen your name enough to know that you should know that getting flagged is not a 100% guarantee of doing anything wrong, and if the comment or poster did do something wrong it might not be obvious from the comment itself. Generalizing from flags to a rule about all comments under your own post, as you seem to do here, seems wildly unsound to me.