What dissertations? Setting aside interpretation, were there factual errors in that video? I've read the books. I've now seen the video. The controversy seems to center mostly on a failure of reading comprehension and an ignorance of both literary devices and various uses of the word fly (which is particularly ironic given a certain exclamation made especially popular by the movies).
Now for my controversial take: This "controversy" is pretty emblematic of the many ways the films distorted and mutilated Tolkien's stories and characters.

This gives me God Emperor of Dune vibes.