Although the documentary itself is new, some of the info seems a bit dated. There were other things I didn’t know. For example, it claims that in Pyongyang, there’s a massive vault filled with yen, dollars, and euros, in cash. It also claims that North Korea continues to operate out of Macau, selling gold (among other things). It also discusses North Korea’s statue-building business in Africa, and its slave-labor exports.
The documentary also claims that Jang Song-Thaek was purged because of a shortage of funding and because his control of wealth was seen as a threat. That makes sense to me, but I would still treat any “insider” accounts with great suspicion.
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Update: OK, I finished watching it. It’s well worth seeing, although based on other information I’ve seen, I don’t agree that Kim Jong Un’s hard currency streams are dwindling. Just look at this chart.