I watched the first half of the interview, and what struck me was the repetition of the word "Novel": the book is a "novel"; the film is a visual dramatization of a "novel"; what it was like to turn a "novel" into a film. So that's the talking point: no matter that the title page of the book lists a series of claims with the headline "FACT", the message is now that DVC is a "novel" and thus anyone who has a problem with DVC is, well, incapable of recognizing the plain literary genre known as "novel."
Actually, Remole, stating something is "fact" or "the truth" in novels is a fairly common literary device. It gets the reader's attention, and is most often used to make very clear what the storyteller's perspective is. I used to read a lot of Kurt Vonnegut in high school, and I remember him using that on occasion for things that were obviously not "the truth."
Don't take it literally.