That’s my fault. North Korea has infrastructure comparable to parts of the US.
The US has many sections of populated country with crumbling power lines and crap roads and schools that cannot teach the basic fundamentals. The simple fact is that NK has greatly increased its power porduction, is spending a huge chunk of money on sustainable energy, has modern internet connections (obviously censored to a degree higher than any other), has laid fiber cable for their network infrastructure, etc. Their schools are functional and they have developed their own central systems with relatively limited help. They are not locked in a Stone Age, even if they have functional crappy trains.
Their military is all soviet garbage that has only improved their nuclear power, but military is not infrastructure.