https://en.wikipedia.org/wiki/Chollima_Movement
Citation #2 points to a book that collates many sources. Here's what it has to say:
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Wikipedia is just a collection of opinions laundered by loosely-relevant citations appearing next to them (or in this case, completely irrelevant ones).
Also just the lack of context in the quote as if NK was like okay were communist now time to work in the 24/7 mines ceeceeepee 1984 style, it definitely wasnt the absolute devastation the war brought