Terms of political discourse, such as “libertarian”, are pretty fluid and always change meaning over time. Historically in Europe, “libertarian” has meant the anti-statist branch of the socialist party (in contrast with communism, which was, at one time, the statist branch). This is where we get the philosophy of libertarian socialism - and to some degree, anarchism. In 20th century America, the term has been adopted by some outer space ideological shit like Ayn Rand, but has more specifically come to mean the liberalism of trade and free markets. Free market ideology, deregulated economic systems (with some well meaning and sometimes very accurate critique of military spending thrown in), and a resistance to societal organization in general, is exactly what characterizes “libertarianism” in at least North America these days. It just isn’t the same “libertarianism” that Noam Chomsky champions.
I’m not sure what prat is either, and for some reason, I am disinterested enough in the context to bother looking it up.
Also, wuz up Nelson! Good to see you here!