Thanks for this. I always appreciate the people who have the time, skills, and inclination to run this kind of stuff down.
I've been watching the rollout of this North Korean BS story since its beginning, and have been pretty sure from the beginning that it was pure invention, presumably to justify some escalation the West already had teed up. I've seen that all the corporate media have been running with this story despite the fact that no one has presented any real proof.
You speculate that the possible source of this invention is Ukrainian in origin, which is uncritically accepted by the West. I think most of those accepting and propagating such stuff know full well that it is lies, but as long as they can attribute it to someone else, they are more than happy to advance it.
This methodology seems reminiscent of stuff like "Russiagate" during Trump's first term.