I think most those people who do label as liberal or socialist on LW would agree with that sentiment. Getting politcs right is not about being left, right or liberatarian but about actually thinking rationally about the underlying issues. That's post-political from the perspective of the author.
It's also, strictly speaking, incorrect. A set of propositions must have some very specific properties in order to be made into a probability distribution:
1) The propositions must be mutually exclusive.
2) Each proposition must be true in some nonzero fraction of possible worlds/samples.
3) In any given possible world/sample, only one proposition can be true.
(This is assuming we're talking about atomic events rather than compound events.) So for example, when rolling a normal, 6-sided die, we can only get one number, and we also must get one number. No more, no less.
Political positions often fail to be mutually exclusive (in implementation if not in ideal), and the political reasoning we engage in on most issues always fails to exhaust the entire available space of possible positions.
This means that when it comes to these issues, we can't just assign a prior and update on evidence until we have evidence sufficient to swamp the prior and we declare ourselves to arrive to a "rational" conclusion. The relevant propositions simply don't obey the axioms of probability like that. Outside Context Problems can and do occur, and sometimes Outside Context Solutions are the right ones, but we didn't think of them because we were busy shuffling belief-mass around a tiny, over-constrained corner of the solution space.
I'm not sure how what you relate to what I wrote.
Plenty of policy ideas on LW are outside of the standard context of left vs. right. I don't think that this community is reasonably criticised for for thinking enough about outside context solutions.
Cover title: “Power and paranoia in Silicon Valley”; article title: “Come with us if you want to live: Among the apocalyptic libertarians of Silicon Valley” (mirrors: 1, 2, 3), by Sam Frank; Harper’s Magazine, January 2015, pg26-36 (~8500 words). The beginning/ending are focused on Ethereum and Vitalik Buterin, so I'll excerpt the LW/MIRI/CFAR-focused middle:
Pointer thanks to /u/Vulture.