These statements were intended for the people of North Korea and not directed at the US. Everyone remember Baghdad Bob, Saddam's media guy? They were being steamrolled, yet he went on Iraqi TV and claimed they were pushing the invading forces back.
This sort of stuff is put out to keep the locals calm. North Koreans supposedly don't have contact with the outside world, but I'm sure some people do and that rumors develop from that information and spread. Thus forcing the NK government to state they would do a preemptive strike.
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