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).
Lankov is very lib, but he wasn't yet caught at lying, just omission and selective emphasis, which is better than most liberal historians. Among Russian specialists on Korea Asmolov is the better one.
Also, Lankov currently works in South Korean university, so it additionally distorts the picture.
I don't know about straight up lying, but at any point in which the historical record was slightly murky - most notably, in the early chapters, when there is some confusion as to whether Kim Sung Il or Stalin is calling the shots - Lankov consistently reaches for conclusions that belittle the Koreans and question their capacity for anything but cruelty.
The pitch I got was "He's a former Soviet, so he's not coming at Korea with a Western bias".
But Ayn Rand was also a former Soviet.