This was fun last time, leggo again
I'll start with: libertarians have solid takes ~40-50% of the time and many of them just need to be pushed a step further in their thinking to turn against capitalist oppression along with state oppression. The libright-to-leftist pipeline is stronger than most seem to think it is.
You're cool, it's more a question of who's saying a government or state is authoritarian. Is it the workers within that state, or ex-pats and NGOs that are aligned with western interests.
Authoritarian policy is a natural consequence of proletarian dictatorship. Especially a ML revolution. It's the job of the vanguard to crush the capitalist institutions that exploit the workers (which to the owners seems to be authoritarian).
When the vanguard liberalises and allows the accumulation of capital to return, it becomes authoritarian in the opposite direction. It takes from the workers and gives to the new owner class.
Of course, the west would never say this is an authoritarian government. They'd just say that "democracy has returned".
Unless someone can instantly convert all of society into classlessness, then authoritarianism is unavoidable, you'll either have the authoritarianism of the dictatorship of the bourgeoisie or the authoritarianism of the dictatorship of the proletariat. I have yet to see any materially possible way of instant class abolition, so the only way out is through.