"Assume good faith" is one of the HN Guidelines[1].
I think dang walks the walk and applies that principle himself during moderation, to a rather amazing degree considering how long he's been at it and the challenges of the job.
My sense is that Musk earnestly wants to do something similar at Twitter, and that he's motivated by a kindred idealism.
However, assuming good faith on the part of forum participants means that outgroups end up having to tolerate a lot of unpleasantness, so long as that unpleasantness is couched civilly enough and could possibly be interpreted as well meaning. (For example, whether women are biologically predisposed to be less ambitious than men is considered fair game on HN and gets debated ad nauseam.)
It's obvious that dang passionately wishes for people from all backgrounds to feel welcome, but that wish exists in tension with the lenient moderation philosophy.
I've come to believe that HN's demographic skew is a direct and predictable consequence of the moderation philosophy, and that ultimately the skew is endemic and won't budge over time. I'm occasionally troubled by my own participation here because of it, as much as I enjoy and appreciate the positive aspects of the site.
I expect something similar will play out at Twitter, with outgroup participation waning as Musk shapes it according to his utopian vision of what he calls "free speech".