Similar to Ayn Rand, who the author also seems to believe is alive and kicking.
The reason this article seems so antiquated is that it is antiquated! I did a quick Google search, and determined that in was published in National Review on June 8, 1979. So dead people are quoted as though they are making contemporaneous statements about the current status of Libertarianism.
Of course the poster, Exnihilo, has acted in a highly deceptive manner by failing to date the article and thereby indicate that it is more than two decades old. But then I guess I'm not too surprised at his deception.