Earlier quoted context omitted.
Musk was fined 40 million for his stock tweets but I don't think he technically ever engaged in any crypto pump and dump because I don't think he ever actually held (or dumped) any crypto. I assume you have to actually financially benefit from such a scheme to commit some sort of crime. Otherwise you're basically just shitposting about crypto.
Did you miss the "Tesla buys billions of USD in bitcoin" headlines? Along with the "will accept payment in BTC" pump and "never mind, selling" dump?
Unless you can show that he actually mislead users for financial gain I don't think you're going to get authorities involved.