Well, your argument is not that valid. North Korea controls all media and tells them what they can report and not report. We don’t do that. It’s a privilege to report on government property not a right, Trump is not blocking them from reporting in general, they can do their news casts all day long. He just doesn’t want them on government property, which he’s completely legally allowed to do.
It’s not a violation of the first amendment. A violation would be, for example, like the military going in and shutting down a new studio… that’s where the North Korea comes in.