And Elon will argue that's against his First Amendment rights, correctly so imo.

The thing is, your opinion is irrelevant here.

We have tons of laws restricting speech -- against false advertising, against fraud, against libel. Contrary to your opinion, these laws are not against the first amendment.

Similarly, officers of a publicly traded company are prohibited from sharing types of information about the company except at certain times and places. No serious judge or legal scholar considers this to be contrary to the first amendment.

The first amendment isn't a slogan, it's led to an entire jurisprudence around it which you could familiarize yourself with if you so chose.

Slaves were legal at one point - I hope you're not trying to claim all current laws in place are juste. I hope you understand regulatory capture as well, where the market and industry will influence/manipulate laws to benefit for themselves - and whole systems of indoctrination including the legal profession. Arguably I've thought through this more, deeper than you have, re:"your opinion is irrelevant here" comment.

Are you sure about that? Care to point to the legislation?

Not to be too glib, but 15 U.S.C. § 78a, which created the SEC and invested in it broad power to regulate financial markets.

My understanding is that this legislation does not universally prohibit a CEO from stating an opinion about the value of their company's stock.

They won't be able to elaborate - and if such a law did somehow pass, it's against a person's First Amendment rights.