It's always important to look at incentives and motivations when trying to read the tea leaves, and if you look at Delaware's incentives, it's very clear. The whole reason everyone incorporates in Delaware is because they have centuries of handling business cases and have built out a clear set of rules and procedures. That is, businesses go to them more for stability and predictability than anything else.
Musk signed a contract. The BS reasons he is trying to use to back out of it are borderline laughable, and even he knows this, so if anything is just really trying to negotiate better terms. The Delaware Court has every incentive to hold up the established rules of contracts, especially business acquisition contracts, and I'd be pretty shocked if they ruled in favor of Musk on any of his claims.