He doesn't necessarily need credentials to talk about race issues (because he has lived experienced), but when it comes to the history, sociology, and theory related to those issues discussed, yes, I would like to hear that from someone who has studied it extensively. I'm not sorry about that.
Considering the fact that you said "this isn't college, it's a documentary/movie," why do you think it included actual academics? Why do you think just about every documentary includes people who have actually studied the topic in a substantive way?