https://arstechnica.com/tech-policy/2023/05/musks-tesla-tweets-to-remain-on-sec-leash-court-rules/

Tesla CEO Elon Musk hoped that the Securities and Exchange Commission (SEC) would narrow or possibly even end the terms of a 2018 securities fraud settlement that require a lawyer to review his Tesla tweets before he posts them. Instead, a federal appeals court today rejected Musk's claims that the SEC's consent decree violated his First Amendment rights by placing a prior restraint on his speech.

This means Musk is stuck with what his lawyers called a "government-imposed muzzle" on his Tesla tweets.