There is no doubt he has promised many things that have never been delivered, or delivered extremely late.
He (his companies/teams) have also utterly changed the space launch landscape to the point of making the rest of the world irrelevant. Changed the energy market across the globe, delivered exceptional electric vehicles and (finally) put a car on the road for public use with no mirrors, steering wheel or pedals. The production line is also world leading, as stated by every auto CEO that has toured it.
Does he over promise and exaggerate? Undoubtedly.
But he does also deliver.