The reason he said so is to attract investors. So far, none of his XYZ came true.
i agree. He could have said "I am building a helicopter, it might have X performance, and err, I've no idea when it will be ready", but nobody is going to put a deposit down on that!
I hope he succeeds, but I think he has an enormous mountain to climb and at some point he has to say to people that either the price, timeline, or specs are not going to met as per his promises.