Very interesting post, and I wholeheartedly agree with the China part, but I have to say the instability of the regime is significantly overplayed. The whole video thing is being used to construct a Western fairy tale.
Somehow it is being made as a sign of rebellion, of cracks in the system, imminent collapse. True, the 'army first' ideology is a very strong pillar of the DPRK regime, and of course it is uncommon to see people being uncooperative with army officials. But that is just ideology. Merely the means to keep the masses compliant with authority.
But authority has many forms. As in every corrupt regime the currency of North Korea is loyalty. Every North Korean has a pin on their chest; of Kim Il-sung, Kim Jong-il, or Kim Jong-un. Sometimes a combination of them. These pins have to be earned, they are passed within the family, and they are very clear signs of allegiance. Shiny new pins means a well-connected person enjoying political favour. Whoever this woman is she has a vehicle, whereas most people use bicycles or ox-carts (without oxen, unfortunately). She has fuel to run it. We take these trivial things for granted, but in North Korea this means a lot. She definitely has the right combination of pins on her chest.
The army uniform shows no pins, they are their own faction. Ordinarily the army uses no vehicles, of course, because they have no fuel to spare. The DPRK army is proud of their wood-fueled trucks. Its like a steam locomotive, but stupider. Party officials drive around the wide Pyongyang boulevards in Mercedes-Benz though. Their relatives can have trucks. And can impose the authority of the ruling elite on hapless schmucks like the soldier on the video.
So, nothing really new to see there, just the firm grasp of the ruling elite on the rest of North Korean society. There must be some fanatics, but regular people don't believe all that ideology crap anymore, if they ever did. There is too much information coming in from the South. Still, everyone knows they are expected to act as if they did believe it. And for the sake of their family and future prospects, they do. They remain under control, and things stay exactly the same as 5, 10, 50 years ago. A less attractive story, but truth usually is.