Basically, legally Musk is already past this point -- he signed a contract promising to buy Twitter without doing any real investigation. I've felt for a while he's looking for ways to squirm back out, but he legally can't (unless he simply can't raise the funds at all, that's what the $1 billion "exit fee" you may have heard about is).
Of course it's possible Elon will simply ignore the law, as in practice the rich can often simply ignore laws they don't like with limited consequences.