>>99242
He was, and it was pathetic. If you have a strong methodological foundation, then Caplans essay is an annoyance to read. There isn't even much to learn from it. I have heard the theory that he left Austrianism behind to flock together with more mainstream scholars.
Nevertheless, him and David Friedman are libertarians, I'd say. Whether you are a libertarian or not is a matter of what policies you propose, not really of the ideology and methodology behind it. At least, I would say so. Doesn't mean they aren't lesser libertarians, if they are less principled about it.
As for Milton Friedman, I would not call him a libertarian. Same with Hayek. They were classical liberals, perhaps, or whigs, but not libertarians.