Poor comprehension of the law. LLC in the vast majority of the western world means limited liability, not absolute immunity. Owners are 100% responsible for the actions of their companies, but their liability is limited when other members of the company act without their knowledge or in bad faith, or damages are unintentional. If the damage was intentional and the actions were sanctioned and approved by ownership or leadership they are absolutely liable for the legal repercussions. Liability is limited also for multiple owners, a hedge fund cannot be held responsible for the action of a company they only own 5% of and has an indirect influence on the actions of leadership. The really important element here is that Musk is being identified as acting as primary agent, not just Twitter, and using assets and resources from his other companies. Thus, it's not Twitter acting, it's Musk who is acting, and then fines can be on all of his capital holdings, not just Twitter. This nuance of law is exactly according to the laws in place in the EU.

But it can't be retroactive. If you change the nature of legal protection, that should only impact actions going forward. Ex post facto laws are illegal in the US, as they should be in any country where the rule of law is to be taken seriously.