The impression I got from looking at their graph is that a strong libertarian component is enough by itself. It wouldn’t be the first time I’ve seen people consider libertarianism inherently very regressive.
Edit: Originally I assumed that it was accusing Less Wrong of being neoreactionary, but looking a bit around the site it looks like they might be praising it.
While I’m not sure what “neoreactionary” refers to specifically there are lots of reasons that certain types of liberals see LessWrong as reactionary:
A somewhat strong libertarian component
Belief in evolutionary psychology
Anti-religous (or generally the belief that beliefs can be right or wrong)
LessWrong’s more technical understanding of evidence is incompatible with standpoint theory and similar epistemic frameworks favored by some groups of liberals.
Those older discussions around PUA where it’s presented in a pretty positive light
Glorification of the enlightenment.