I think he's referring to the scale of left-right in Europe and South America. Meaning the "center" in Europe and South America has usually been more to the left of the "center" in the United States. So a Bay Area minimal-regulation, minimal-government libertarian would be far-right relative to the average right-wing "liberal" in Europe/SoAmerica, who might be ok with more market regulation and a safety net for the poor.
Nationalism maybe, but then libertarianism and nationalism aren't necessarily any more right-leaning than the other, it isn't clear-cut. Outside the US bubble (including South American politics bending over to the american way of life--a foregone notion) libertarianism is seen as pretty extreme and elitist, if not very naive and hopeful instead. Actual fascism and authoritarianism are totalitarian, dystopic realities, maybe extreme right but even that would more often be conflated with far-right than with totalitarian regimes, which in a way are already beyond "normal" (parliamentary and such) politics and more like, you know, a dictatorship, or the seizing of power with disregard for the constitution.
