The Political Compass shows that authoritarianism is on a completely different axis than the economic policy spectrum. You’re correct. I’m not sure of any true, long-lasting authoritarian left systems though, since they seem to quickly transition to cronyism oligarchies, enriching the people in power. Maybe the oligarchs don’t directly own the means of production, but using their seat of power to skim money off of the fruits of the productivity is just unfettered capitalism with extra steps.