No.
NK have been living under some varying degrees of siege mentality for decades - they've long planned for the eventuality of not relying on major infrastructure if it comes to it and likewise accommodated for the US's superior abilities when it comes to ewar and ability to jam their communications, etc.
Most of their population are born into a military first society and there are many sections that are well drilled and trained - while there might be a percentage that would be less patriotic and more inclined to run etc. they have their own versions of stuff like the Nazi SS designed to prevent that.
Its a common misconception with regard to their ability to supply their army - vast amounts of their resources go into storage (though I wouldn't want to guess at what kind of state the stores are in) which is guarded by loyal forces only the very minimum amount required to keep things running and barely that go to active units - there may also be an aspect to that of ensuring that there can't easily be an armed uprising/coup overthrowing the leaders. While exact numbers aren't known its estimated from analysis of their crude production, supplies smuggled in and imports/exports, etc. that they likely have enough in reserve to supply their army at full strength for 4-6 months of fighting - minus whatever is wasted due to storage conditions.
Pyongyang has one of the most dense air defence networks in the world even if antiquated that is somewhat offset by the sheer volume of fire they could put up and while their radar systems are old this is a bit of a mixed story as those old (but upgraded) long wavelength systems have some ability to detect stealth aircraft and while they lack sophistication again they can just open up with everything at the vague data they have.
The rest of the country is densely packed valleys which gives a certain amount of natural protection against shock and awe tactics.
They also have quite a bit more in the way of supplies for their army in reserve than is generally believed - they've been sticking **** loads of fuel and ammo, etc. into old salt mines and the likes.
Yes, every country no matter how much you think doesn't need infrastructure does.
As for Pyongyang been one of the most defend cities in the world means squat when the US & its allies are able to put a missile within a 3 metre radius of where it needs to be, and its doesn't matter how much fire they put up they're likely to down very little of those missiles that's hitting the capital & elsewhere.
There's all manners of available equipment that North Korea will not be able to detect with any of there radars or anything else and as soon as a MML is spotted that's the end of that.