Of those comments, one of them would be killed by now if you'd just used the site's functionality as intended and flagged it.
Without expertise on the topic (and I am Australian, I don't have deep expertise on these topics, and it doesn't seem like other readers do either), the merit of those comments seem like a question of historical accuracy. If there's a way in which the content of these comments breach the guidelines (and no, the guidelines don't permit people to, say, support fascism or genocide as long as they're polite about it as it's been facetiously put in the past; anything that is unkind or abusive or oppressive to other people is against the guidelines here), you or anyone can explain that in a reply or an email to us. We understand that sometimes comments break the guidelines in ways that aren't obvious at face value (as you put it "dog whistles"), and in these cases people can, point this out in comments or emails to us. Positive contributors to HN do this all the time. Nobody has done that in this case, but you're welcome to do so, now or in any other similar situation.
Edit: I was reflecting as I took a walk that this discussion is almost a mirror image of one I had about a week ago with a user who seems to be on the other side of the political spectrum. Like you, their belief was that HN's discourse and moderation is biased against their political persuasion, and that this entitles them to disregard the guidelines and engage in battle against what they perceive as malevolent actors on the site. We've seen this effect forever here: the more strongly someone is focused on a particular ideological issue, the more keenly they notice anything that breaches their sensibilities about that topic. Dang has written about it and cited examples of it many times over the years:
https://news.ycombinator.com/item?id=26148870
https://hn.algolia.com/?dateRange=all&page=0&prefix=true&que...
And in this subthread just three months ago, a banned user insisting that there's a “hard liberal-progressive tilt to comments and post flagging”:
https://news.ycombinator.com/item?id=43136198
The truth is we don't – and can't moderate in support of any particular ideological agenda. We just don't have time to pore through all the comments and manoeuvre things in a way that pushes things one way or another. All we can do is respond to the bad stuff we see, which we can only do if people use the site's feedback mechanisms to alert us to things that need our intervention.