Not sure why there is almost no mention of this after the initial report.
Because in order for it to be a causal factor, the world of probability would have to be suspended. For a NorK missile to get that far in the first place it would have had to get into space. Wouldn't have the fuel to go that far in the atmosphere. It was a stupid thing for someone to say in the first place, I suspect once told that they have hidden since.