We do know about North Korea. It doesn't exist in a bubble. It's a product of a particular culture and a particular series of historical events as well as regional and geopolitical relationships, most notably its relationships with South Korea, China, and the US.

The claim that the North Korean dystopian dictatorship could be generalized to all cultures, across all cultures, merely on the economic and military capabilities of AI, is an extraordinary one. It relies on a great many assumptions about the political as well as independent, personal, and organized responses to the societal changes that would need to take place in order to bring it about.