

They do have some access to external info, people smuggle media into the country from South Korea, of course there will be blind believers but there are probably a lot of them putting up an act so they don’t get killed. If they were all brainwashed, none of them would risk their lives to cross their border and escape NK
Going in neutral without expectations is the best way to enjoy a movie in my opinion, there’s a indie theatre near my home that mostly plays older classics from US and around the world. I’ve had my mind blown by movies that came out decades ago, good movies age very well