There is some excellent legal analysis online (I think someone has already shared the link) that utterly shreds Musk's claims in meticulous detail. His problem is that he signed an 'as is' contract, i.e. sans a shred of due diligence and is now trying to escape from it because his investors have told him in no uncertain terms via his stock price that he has to grow up.
Not a chance of either, methinks..