Entering into a contract that has major implications for millions of people, and then trying to weasel out of it on baloney pretenses that he of course should have known - that makes him a schmuck.

Also, previously, his falsely accusing a random stranger trying to help others, of being a pedophile - this makes him a schmuck pretty much permanently and where no amount of apologies are enough: https://www.google.com/search?q=musk+accuses+pedophile

https://www.google.com/search?q=schmuck - a foolish or contemptible person.