There was a Smarter Every Day video just published where he gave a talk to some people from NASA, some of the things he revealed and how little the people in the room seemed to know were a bit shocking. Like, no one knows exactly how many Starship launches it will take for refueling everything to get Artemis and supported hardware to the moon (the latest paper says "at least 12"), and how the ways they're looking to do are very complex meanwhile the Apollo engineers literally wrote the book on how they did it - TL;DR keep it simple, build in a ton of redundancy.