I believe that this statement was not an endorsement of libertarianism, but rather a sop to libertarian readers, based on my knowledge of his style.
Moldbug draws a clear distinction between libertarian policies, which he believes meet straightforward criteria for effectiveness and sanity, and would (not ought to, but would) be implemented by a Responsible Government (see: neocameralism), and libertarianism as a political philosophy and movement.
He identifies the fundamentally Sisyphean nature of advocacy for libertarian politics within a democracy, and also the untenable assumptions of the Rothbardian non-aggression theory of natural rights, which, barring some bizarre change in the present technological-military détente, makes the absence of a geographically-based state with a monopoly on violence equivalent to 'money on the table'.
I've seen several people on Less Wrong recommend Mencius Moldbug's writings, and I've been curious about how he became so popular here. He's certainly an interesting thinker, but he's rather obscure and doesn't have any obvious connection to Less Wrong, so I'm wondering where this overlap in readership came from.
[EDIT by E.Y.: The answer is that he's not popular here. The 2012 LW annual survey showed 2.5% (30 of 1195 responses) identified as 'reactionary' or 'Moldbuggian'. To the extent this is greater than population average, it seems sufficiently explained by Moldbug having commented on the early Overcoming Bias econblog before LW forked from it, bringing with some of his own pre-existing audience. I cannot remember running across anyone talking about Moldbug on LW, at all, besides this post, in the last year or so. Since this page has now risen to the first page of Google results for Mencius Moldbug due to LW's high pagerank, and on at least one occasion sloppy / agenda-promoting journalists such as Klint Finley have found it convenient to pretend to an alternate reality (where Moldbug is popular on LW and Hacker News due to speaking out for angry entitled Silicon Valley elites, or something), a correction in the post seems deserved. See also the Anti-Reactionary FAQ by Scott Alexander (aka Yvain, LW's second-highest-karma user). --EY]