He has a history of exaggeration, but in this case, the title of the original argument and the claim that there is no libertarian case for vax refusal seems to be pretty accurate.Well, that would be shocking...
I will add that the gist of the "libertarian's" argument seems to be the reduction in number of cases/illnesses/complications/deaths from contracting the diseases. That is always the basis for co-opting the government to coerce people into behaviors that they would not choose on their own.