I don't see this as saying to put hobbies on a resume. Rather, he was asking about hobbies and considering that someone who had none wasn't going to be a good

I don't see this as saying to put hobbies on a resume. Rather, he was asking about hobbies and considering that someone who had none wasn't going to be a good fit. Someone can be very good at their job but in a startup situation you need to be flexible--and he's saying someone with no hobbies isn't going to be flexible enough.