Can there be such a thing as a progressive/leftist who is pro-authoritarianism?
Not really.
Progressivness is about freedom, authoritarianism about the lack of freedom.
But someone could hypothetically be an actual communist and an authoritarian. Because communism is just an economic system.
In practice the only way it would work is “mob rule”. Like what happened during the French revolution where people rose up, killed the ruling class, and then distributed their wealth.
But even that wasn’t the same because the mob didn’t attempt to distribute it equally. Everyone just grabbed shit.
I think it’s especially confusing to people with a two party political system, because economic and social policy start to get intertwined, when they’re two different things.
Which a cynic would say is intentional so that no matter who gets elected, the wealthy win.