The language of the settlement that he signed in September states that he has to:
comply with all mandatory procedures implemented by Tesla, Inc. (the “Company”) regarding (i) the oversight of communications relating to the Company made in any format, including, but not limited to, posts on social media (e.g. Twitter), the Company’s website (e.g. the Company’s blog), press releases, and investor calls, and (ii) the pre-approval of any such written communications that contain, or reasonably could contain, information material to the Company or its shareholders.
That language doesn’t say every tweet he crafts needs to be run by a lawyer — only the ones that could influence the market. In theory, then, Musk is free to tweet “I [black heart emoji] anime” without consulting one of Tesla’s lawyers.