I’m not the IO Who may or may not allow him to get in so I can’t give a 100% answer on which way is best. And as far as I know neither are you. With the recent shake up with Visa exception.
Non of the past visa gurus can say anything with 100% because there isn’t enough empirical data to support their answer.
But one thing that still stands true is flying in is still better then driving in, so I provided the best possible advice. Which isn’t misleading, isn’t demeaning and still carries the support of vast majority of members of this group, flying in is better than driving in.