Being libertarian doesn’t need mean one’s an anarchist (or even a minarchist!).
And he’s also libertarian in the sense that the unadorned word has been used in the US, a right-libertarian, rather than how it was historically used in Europe in an unadorned sense, left-libertarian, where I’d say that it was somewhat-closer to anarchism than the more small- or minimal-government right-libertarianism.