At least partly that is about being topical for their audience. What I am trying to point out is that just because it is written from a different perspective or for a different audience doesn't mean that it is wrong. You and I might dislike things about Hacker News, but by being here we have accepted those things. But when they write about Hacker News, they don't have to fit into the Hacker News narrative like we do. They don't have to avoid calling out what they see as bad or find what we see as good.
That certain topics can't be discussed because they disappear from view is a defining characteristic of Hacker News. But on Hacker News it has always been justified by it not being moderation. "It was flagged by users" is the common explanation. But for someone coming from the outside, that isn't blinded by internal politics, it doesn't really matter as the result is the same. The same is true of other dogmas or faux pas. For their perspective to be damaging it has to go beyond valuing different things.
The other reason I have a bit of a hard time seeing it as judgemental is because they provided a lot of space for other perspectives (and even link to discussions). And those perspective seems consistent with the different positions. The article for example does not only address your perspective on the moderation, but conclude with it. They specifically and at length talk about the style of moderation and mention things like dead comments. You might even say it is the entire premise of the article.
Finally, I agree with your last sentences. sctb and dang are painted in the best possible light throughout apart from the paragraph of the author's expectations. I perhaps was much too mild with my praise at the end of my comment; I did find those parts important and interesting; I don't think I've ever heard of a moderator invoking actual philosophy in their methods of dealing with users. I still believe even if that was the conclusion of the article (the gallant mods fighting the hordes of tech bro sexists), the premise is still flawed because of what I've addressed above, the sexists, racists, etc are a minority contingent, just like there are in most of the popular forums on the internet.
What topics are those? When I hear claims like this, it usually turns out to be a topic that gets plenty of discussion on HN—just not as much as someone feels it should. It never feels like one's favorite topic gets discussed enough (see https://hn.algolia.com/?sort=byDate&dateRange=all&type=comme... for why), but that's not "it can't be discussed".
> But on Hacker News it has always been justified by it not being moderation.
We answer questions about moderation all day. When asked what happened to a submission, we say what happened. If users flagged it we say users flagged it. If we moderated it we say we moderated it. How do you get from that to something sinister?
> "It was flagged by users" is the common explanation.
Yes, because it is the common reason.