The term "authoritarian" is so fraught that under these circumstances it might as well just mean "opponent of the United States" or "organized at all".

The examples you have provided are quite absurd.

Tiananmen Square (which you misspelled) is indeed poorly understood in The West, including the historical conensus that there was no massacre in the square itself. It is, in fact, historical revisionism to suggest otherwise. In addition, Tiananmen Square is just a place, a very popular one to visit that has been the location for all kinda of events. In China, the events are called the June 4 Incident / events. Calling it "Tiananmen Square" is sometimes a sign that a person is not familiar with the history as they are using the common but misleading term that is virtually only used to forward the previously-mentioned historical revisionism to a Western audience that is in no way interested in understanding.

Re: Uyghurs, I would suggest that you read into this much more, as the topic is full of misinformation, think tanks with shady ties, fake universities, charlatans pretending to be experts, literal teenagers treated as satellite photography analysis experts, and really weird NGOs, including pro-Trump ones. One good topic to focus on is calling it a genocide at all and how that came to be the discourse. In particular, what The Newlines Institute is, why they were amplified by the US State Departmwnt, their rationale, and, of course, why none of that is taken seriously outside of a very specific political block. Following their members, funding, etc is actually a pretty interesting rabbit trail to follow. Bird's eye view, the rhetorical treatment of Uyghurs as the subject of genocide was more or less invented, and this is is why you naturally don't see math death, destruction, refugees, or forced migrations of the Uyghur population. This does not mean bad things haven't happened there nor that policies were not hamfisted, but just compare how China treated a series of sectarian knife attacks (education, jobs, vocational training, investment, banning extremist Salafist practices) to how the West treated and treats Muslims (invading and killing millions).

So, anyways, I hope that you can continue your education and engage with these realities in gold faith.