Even taking that report into consideration, the North could not knock us out in a a couple weeks, and that is what they'd have to do in order to neutralize our ability to move large numbers of men and hundreds of thousands of tons of material into the area. Much of the air and ground strength we have in the south is not with in easy striking range of the border. It would be too easy to wipe out there. Much of it is stationed in Japan still. It would be foolish to station most of our armored, artillery and air strength within the North's striking distance of the border. That would be beyond stupid.
The North Koreans can't knock us out but they can wreak so much havoc within a 1000 mile radius.