This is only a sensible argument if you define censorship as violating the letter of the law of the US constitution or of another constitution that does require

This is only a sensible argument if you define censorship as violating the letter of the law of the US constitution or of another constitution that does require individuals and companies to respect basic rights. But if you consider the purpose of freedom of opinion -- to enable the public discourse necessary for a democratic society -- this is absolutely censorship.