Stuff like this blows my mind. Beyond the obvious incredible thickness of the author and inanity of his "analysis", the consistently spread idea that "Hollywood" (which is not an entity) is the "propaganda arm" of the "establishment" (also not an entity) that runs through a lot of right-wing thought is hilarious. There is no vast conspiracy to control the media and brainwash people into going leftward. I know countless producers, writers, directors, actors - there's no illuminati group pulling the strings.
There's actually a huge variance of philosophical thought in Hollywood professionals, but overall, they do tend to the left. There's actually a good reason for that.
Most writers/actors/directors are transplants, who move to LA from other places to pursue their movie dreams. They want to tell stories.
Storytelling, by its very nature, requires empathy. Increased empathy often leads people toward progressive political ideals.
It's that simple. No conspiracies required.