That’s just changing the definition of censorship to muddle the argument. The idea that censorship can
only be done by governments (not even by private entities on behest of government) is to make the definition so narrow as to be effectively useless. Even in China most of the censorship is done by “private” companies.
While the XKCD explains that your “United States 1st amendment rights” are not be violated by non-governmental censorship, it doesn’t change the fact it is censorship. Everyone is in favor of censorship (like Randall) so long as only things they disagree with are censored.