No matter how you may feel about (all) nation-state sponsored media outlets, AlJazeera deserves respect for this excellent footage they got from inside the factory. It's a few years old, but should have raised more alarm by now:
I dunno this video seems like a pretty typical overly stylized made for TV documentary. Lots of cuts in the editing plus not discussing the actual issues in any depth. Maybe the issues presented here are real, but the narration is unreliable.
https://www.youtube.com/watch?v=rvkEpstd9os