You are absolutely correct. This movie (I hope to see it soon, but I don’t know if it is even playing around here) is not about evolution so much as it is about bias and inhibiting free speech on college campuses, where, if anywhere speech should be at its freest.
As for the scientists who say they thought they were being filmed for another movie, are they saying that they would have changed their answers (i.e., lied) if they knew the true reason for the film?
I have no real interest in seeing a film that makes a scientific or even a faith-based assessment of evolutionary theory. I wouldn’t mind seeing a film about a scientific basis for the origins of life, but I doubt THAT movie will be made anytime soon.
This film could be about any number of forbidden areas of speech and belief at our so-called liberal arts colleges and universities.
From what I interpret from a CNS article posted here 4 months ago, the film's not really about campuses limiting free speech but about campuses not allowing ID to be taught as as science (which DesignOrigin’s FAQs starting with #3 explains why it isn't). But I don't doubt that as an ID activist, Ben Stein frames standards in science working to their disfavor as a freedom of speech issue.