It isn't. It is a settlement agreement that Musk personally and Tesla agreed to in order to avoid additional fines and penalties from his previous misconduct.
Musk hasn't made similar tweets since then, so it seems plausible that SEC did indeed give some sort of warning, or that the parties have had some sort of clarifying exchange regarding their agreement.
This is all a matter of public record, it was not handled behind closed doors.
Ultimately Tesla and Musk agreed with the SEC that his previous conduct was wrong, and that's how we got to this settlement agreement. So to argue now that the SEC is wrong and that Musk's behavior is fine because that's his "style" seems to fly in the face of Tesla's own viewpoint on historical events vis-a-vis misleading tweets.