Not really disagreeing with the other comrade there, but more adding for clarity: the word "authoritarianism" seems to attempt to distinguish some state (all of which are entirely defined by the fact that they have authority over the land/people to utilize violence in implementing the state's dictates/laws) utilizing it's authority vs not utilizing it, but the claim we make is that this distinction is meaningless and undermines itself always.
The fact that is that we can't blow up pipelines because of property rights or else we will have violence done to us (put in prison, or killed if resisting that). This is authority over us. Chinese companies are not allowed to escape regulations within China without significant punishments (see the death penalties for CEOs who break environmental, finance, or labor laws). This is authority over them. These 2 examples are only distinct in who has the authority and who is prioritized in the interaction. But 1 is called authoritarianism and the other isn't. Or compare: in the US, police who hurt journalists, imprisoned them, and saw absolutely no authority punish them vs the USSR, where those who has collaborated with the Nazi's in WW2 were punished by being placed in a penal colony in Siberia to work in a mine. Again, the only real difference in authority is for whom and against whom.
I for one would prefer a world where oil company's property rights were not protected by any authority until astonishingly large changes were to be made for the protection of our environment, and I see the interests of ONLY the capitalist class represented in that authority. Most cases where authority is utilized can be easily tied to the direct interests of a group of people. When a group of people have shared interests based in the basic structure of our economy (private property rights and the ability to profit being the basis here mostly, as well as the ability to sell your labor power as a worker), we call that a class. This is why we say that authority is always performed in the interests of a class (because all actions and decisions of the state either align with or against those interests, even if mostly tangentially or aligned with multiple at once).
This all just has very little to do with any understanding of democracy. The initial term of democracy was basically where everyone votes, but this term is not really used in the contexts we are talking about anymore and is restricted to small groups. We now usually understand democracy as either the sort of chauvinist version westerners use (where being a republic with votes where American observers are allowed is really the only criteria) or just a system which is able to take input from its people and perform in a way which the people approve. Whether this is direct voting, voting for a representative, or public caucuses and discussions is less material than the fact that the information is utilized and the outcomes desired are reached. (Edit addition here, something I thought of while responding elsewhere that fits here well: when authority is used to dictate a majority vote onto a minority, its precisely democratic in a simple sense and authoritarian in every sense. It's why I support a democracy which first has intense debate about what interests and results will arise from policy before it's ever up to vote and implementing it once there's a lot of consensus among parties. Cuba is the best example of this, but Vietnam, China and the USSR are also fine examples)
On these standards, both the USSR and China (as well as most other major socialist countries commonly called undemocratic) are much more democratic than the US or any western state. The approval ratings (even by western polls within these nations) are much higher than western nations. This is because both the authority and democracy is oriented towards workers as opposed to the owners (meaning that private property and owners/management profits is not prioritized over the workers/people who work for wages).
To add on here, the fact that liberalism is a bankrupt ideology which is fully represented by the US including its worst aspects can really not be shown in a comment in such a thread. Domenico Losurdo, in one of my favorite books ever, spends hundreds of pages detailing this in "Liberalism: A Counter History."
A much more easily digested but still incomplete essay can be found here: https://redsails.org/between-liberty-and-slavery/