TLDR; According to article, SEC did do the "swift" investigation and it seems they were convinced Musk had no hard evidence to back up his $420 claim. They even

TLDR; According to article, SEC did do the "swift" investigation and it seems they were convinced Musk had no hard evidence to back up his $420 claim. They even drafted settlement agreement that was supposed to be signed which I'm guessing involved removing Musk from exec position. However at last minute Musk's lawyers decided not to go for settlement and now they are going to fight the case. I'm thinking they probably cooked something with Saudi to corroborate the claims - may be in exchange for some future deal. For whatever reason, Musk lawyers have figured things out so at this point Tesla is buy for me.