And pretty much all the founding members of Lesswrong and, going back further, transhumanism in general, were of a certain sort which I hesitate to call "left" or "liberal" but... - socialists, libertarians, anarchists, all those were represented, and certainly many early users were hostile to social justice's extremeties, which is to be expected among smart people who are exposed to leftie stupidity much more often than other kinds of stupidity... but those were differences in implementation.

That's not exactly right. Moldbug did comment on OvercomingBias in the days before there was LW. This community came into contact with neoreactionary thought before LW existed. Michael Anissimov who funded MoreRight was MIRI's media director.