I would consider authoritarian a useless word for describing them. Sure, you could call them that and it would fit, but it says very little about them and fails to distinguish them from other states.

All states are authoritarian. Holding and exerting authority is the point of a state. The state exists as a tool for a class to express its authority over the other.

This same issue applies to the term dictatorship as well. When we hear the term authoritarian we must ask authority for whom. When we hear the word dictatorship we must ask what group is dictating and to what end.

Until the state is abolished every society is authoritarian and a dictatorship. So what’s the point of the descriptor?

Edit: if I have been too vague I’m happy to elaborate further