There has never been such a thing as a politically neutral HN. It's just that there wasn't until recently a userbase to counteract the liberal tech groupthink.
As it's grown bigger, it's started to reflect the demographics of software/data/professional people, with a bias towards the West Coast of the US.
That's presumably what you mean by the liberal tech groupthink (note that disliking Trump does not make one a liberal, which is a mistake a lot of conservatives have made over the past four years).
Interesting. I came here a bit late.