From his questioning it sounds like Lex appreciates FSD's challenge and possible shortcomings. And probably no surprise Karpathy's timeline for autonomy is open-ended based on belief and intuition. On the other hand, he says the Tesla Bot will take a long time to solve. I bet Musk doesn't agree.
Interesting when he described the early days when the self driving system failed from quick turns or when the roadway rose or fell away. I have an intersection and roadways where I suspect there's still a remaining remnant of that. Probably an inherent issue that can only be minimized.