I'm inclined to agree with you. However, if only the state can create a special district, and if Disney wishes to have a special district, they have to engage with the state, or file a lawsuit to attempt to overturn the legislation which dissolves RCID in June.
In today's political climate, and given his personality, DeSantis isn't just going to roll over and give Disney back RCID. He couldn't even if he wanted to, politically speaking. The most I can see Disney securing is a split board like I described; I can't see DeSantis signing off on a plan which gives Disney appointees majority control, and if DeSantis isn't on board, I'm almost positive a majority of the legislature won't be either, given the new supermajority the GOP has. And then there's his veto power...