You can actually see at the top of the post that it was a different chud who said Koreans can't leave so I do understand some of the confusion.
Westerners in general also don't think of the DPRK as a real place with real people. The DPRK is more of a thought experiment to them. You're allowed to say whatever you want about the DPRK and it's never supposed to be questioned.
To ban.