Oh, have you never dealt with lawyers? There are usually multiple valid interpretations of a contract, depending on what side you are on. I didn't claim to be an oracle of truth, I'm not even tangentially related to this case (as I suspect 99% of the commenter here are).

This is a legal matter, and often it comes down to which side argues their case better. It isn't code where there is only the factual interpretation as seen by the compiler; law takes into account the fuzzy human interpretations that often frustrate programmers. Ultimately, this contract will be enforced by the courts in whichever side makes a better case.

Note that this may mean that even if Elon is in the wrong by canceling, the court may find in his favor simply due to the potential economic fallout. Sucks, but if law was a cut and dried thing we would have eliminated lawyers long ago.