Unless you know different, Musk says that per the terms of the contract they did not fulfill numerous terms of the agreement. Some, not all, he spelled out, being providing him with the real numbers of spam account data. So to my understanding, the way a contract works is both parties have to, ya know, do what the contract says, or deals off. If twitter had it written into the contract that if they got a higher offer they could back out, and then they did. Musk sued and claimed no such offer exists, that would be a more proper analogy.