Fiftyseven:
Responding to a comment before I'm not sure if its Korean, but that was the post I had found this link from had said.
Ney:
Yeah. I deleted the part, cause as I saw the pictures and gifs of the website I linked up there I was sure it is Korean. At least the subtitles are. But the website you linked, I'm pretty sure it's Chinese, although it's called ''kknews'', because I don't see Korean symbols in between, but only Chinese ones.
However. Seems like I'm a bit caught up in analysis right now. Maybe also just because I learned Japanese in school. So I did that ''what-asian-language-is-it-game'' a few times before while researching something.
I don't know any Asian symbols, so I can't help with identifying them. This was just the only other website that went over the documentary. If there are no leads, the safest bet is just to spread the video as far as you can. Then hopefully someone will know of it.