But I have not looked at their analysis in detail. Let me give you an example from the video.
At around 3:40+ they begin to talk about the apparent weight of missile based on NK video of the missile being lifted by a crane purchased from Japan. Because of where the center of gravity is located, they note that the missile must be quite light, and conclude that it was produced using highly advanced materials and construction techniques. That is just one of the possibilities. The other, more likely explanation is that the missile in the video is a hollow shell mock-up. There are similar problems with drawing conclusions from pictures of horizontal fueling, the alleged small thermonuclear warhead that nobody has inspected, etc...
Kim clearly wants the world to believe that he has deliverable fission and even fusion warheads, but barring close inspection from an international team, there is every reason to believe that like most NK propaganda, it is largely fake. That would not mean that they are not dangerous, only that they cannot be delivered by aircraft or missile.
North Korea definitely has constructed and detonated nuclear devices, but it is quite likely that these were primitive and massive. They have also launched a few long-range missiles - with a very high failure rate and questionable payload capability.
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