"Authoritarian" is largely a meaningless term. All it really means is one group using force against another group, but it doesn't say anything about which group is which. In the US Empire, the capitalists use the state to crush the workers, and export genocide and chaos to the global south. In the PRC, the working class uses the state to keep the capitalists in check as they progress and develop along socialist lines. This stark difference in which class is in power is shown with immense popular support in the PRC: