I mean, it's orbit isn't exactly a secret from anyone who actually looks at the space for a living, or tracks things in orbit for a living.

Anything new will be visible, it still is going to reflect light and all the stealth tech in the world can't (yet) make something invisible to the eye.

That little dot that keeps zooming above every 90 minutes or so that wasn't there a week ago is a good candidate...

Having said that this is not someone who did this for a job. It was a hobbyist. I've seen some impressive hobby shops but it's still a very impressive feat.

Besides I'm sure if it were launched with spacex, even NK probably already has a full briefing provided by certain a certain rat on everything they knew about the Initial launch.