I strongly suggest you don't take the information from a documentary, which is focused on engaging story telling in order to make money, with a balanced and complete view of the situation.
There was no effort to dissuade further research yourself or to not engage with other mediums. I also don't believe they were supposing your only source of information should come from their casual suggestion. "I strongly suggest" you go ahead and link the research papers you've personally vetted like the poster above you trying to contribute to the discussion did that covers these topics indepth if you feel passionate about the lacking information.
Documentaries tell stories. They often leave out facts that run counter, rarely try and provide a balanced view and their intent is to make money.