Stark. First Ben Elton book I ever read.The morally neutral, polymath billionaire saviour figure is a common trope in sci-fi. Musk's persona seems more suited to fiction than to real life, not unlike most of his miracle technologies.
Even his name is better suited to a character in one of those hamfisted Ben Elton satires than to a real person.
as for miracle tech, we're now landing re-usable rockets on floating sea platforms. Thats pretty good I recon. Even if I won't even get to go on the B ark