That, plus he's quick enough to come up with good follow-up questions on the spot. It's so frustrating listening to interviews where the interviewer simply glosses over interesting/controversial statements because they either don't care, or don't know enough to identify a statement as controversial.
In contrast, Dwarkesh is incredible at this. 9/10 times when I'm confused about a statement that a guest makes on his show he will immediately follow up by asking for clarification or pushing back. It's so refreshing.