Indeed, a fact-checking site is the most reliable thing in the world. A fact-checking site would never lie to you or have a bias of their own…would they?

Russian state propaganda is of course so much less reliable than Statesian corporate propaganda

That’s a debate since authoritarianism to libertarianism is a spectrum so there is no official “normal” and its generally used qualitatively on individual polices

So, essentially, it’s subjective?

Where the state has extra power that they can use to enforce their goals

Extra power in comparison to what? What is the normal amount of state power?

What makes them authoritarian?

A leftist. Someone with political beliefs, empathy, and conviction.