I'm actually curious about the bus, too. Sounds weird. But I trust his judgement, I'm sure it'll be great. He has a track record, you know.
Regarding missed promises, if you're saying that as if to suggest that what he's promised isn't nonetheless coming true at a pace faster than anyone else could have possibly delivered, I think you're wearing blinders.
Regarding "most difficult".......are you aware of other companies working on something as technologically and logistically and legally challenging as SpaceX and Tesla????