HN has been right leaning? That seems an odd take. Most comments I see on here lean more progressive. Or are you talking about the billionaire tech class who are in their own demographic?
Most of the time when I do see blatant “rightposting” it’s so misinformed and provocative to be indistinguishable from trolling / baiting, so I can’t even tell if it’s downvotes for disagree vs downvotes for suspected trolling.
The less blatant “rightposting” flies quite a bit under the radar, pretty much by definition, which is what the grandparent comment was probably referring to when they said they interpreted HN as leaning right. More like laissez-faire economics.
The open embrace of the fascist / nativist right in SV has been more recent, and it has empowered this second Trump administration. The calculation is presumably that they can curry favor and consolidate power.