Indeed the perception of "mainstream" seems to have shifted away from the messaging the administration wants to present in lots of forums like this.
Note how even within the police brutality issue, HN is focusing on organisational incentives for police recruiting and conduct instead of the more mainstream race angle. HN believes in well-designed systems of incentives. The (ideal of the) free market with appropriate minimal regulations is the dream, which usually sides HN with small-c conservatives on economic issues and even makes HN look reactionary from time to time.
Of course, as you say, the administration is anathema to any group of intellectuals. And I'm sure previous administrations would have spun their cases to be more appealing to HN and similar forums. But I don't think the basic position of HN on police brutality is particularly new or surprising.
Disclaimer: Obviously HN is many people who have many opinions which I wrote as a single entity for convenience.
But the "reactionary" crowd is still here -- looking at their patterns of posting on [1], it looks almost tailored to get the story flagged (accounts got banned, but that page only lasted on the front page for a few good minutes). The truth of the matter is that folks are uncomfortable discussing race, because our community has internalized a lot racism. Discussing our society's painfully visible race inequity is "flamebait" because racists gonna show up and drag the conversation down.