This guy is flat out wrong. He's right about people who are members of the Libertarian Party, but people with Libertarian ideals have LONG been one of the key groups within our movement. Much of the Goldwater coalition was comprised of Conservatives with Libertarian leanings. If we purge all Libertarian ideals from the Conservative movement, we become a Religious Party and not a Political Movement.
Though I am unsure when this essay was written, Kirk predated Goldwater and the conservative movement. Indeed, he was one of American conservatism's foundational figures, but he was consistent enough to see the major flaws in the "fusionist" movement which has often usurped the title of conservatism.
Kirk himself would probably look down on today's GOP. He opposed the first Gulf War soon before his death. He denounced automobiles as mechanical jacobins, sacrificing real community on the altar of industrialization. He wrote ghost stories.
Libertarians are more at home in today's conservative movement than Kirk would be, and we are a poorer nation because of it.
(On another note, one of his daughters has a blog.)