I believe hype is actually Musk's primary product: by constantly coming up with these announcements he plays his part in maintaining the narrative of the US being the leader in tech innovation, over and above the narrative of the US being a formerly cutting-edge economy that is in the process of falling behind. (Which one is actually true is debatable, but managing perceptions is an important part of keeping the economy running.) Someone who merely organized solid electric car manufacturing or workable private space launches would probably not be as successful in attracting investment.