The problem is how the consensus came about and a concensus isn't always right. In the history of science it generally takes a generation for paradigms to be replaced. This may be what is starting now. Who knows? I don't know for sure and neither does anyone else.
The concensus for decades was that stomach ulcers were caused by acid and stress. It took a long time for the ulcer industry to accept that infection was really the most common cause.
It's most interesting that no one here has actually put forward anything to refute the claims of the many professors in the film. I'd really like to here that.