It's hard to lie about physics. He can lie about his schedules, or how he treats his employees, but not about thermodynamics. When he's talking about rockets, he's historically been fine. This is a good example: https://youtu.be/SA8ZBJWo73E?t=760
I think this explanation would be more coherent if it was given by one of SpaceX's competent and underpaid engineers. They clearly did a good job of dumbing it down to Elon's level of comprehension, so that he could sluggishly regurgitate it to the general public and appear to understand rocket science.