Yes but it sounds like they would get the park. I assume there is no local general purpose government there other than the county.
Which means that Orange County gets the sewage system, water, electrical, roads, electrical grid, and all the other infrastructure that supports the Disney parts Since Reedy Creek did not own Disneyworld, or EPCOT, or any of the other parks, resorts, etc. then the state of Florida has no claim to them.
Disney owns the parks and the land they sit on, not Reedy Creek. RCID is a quasi-governmental entity created to regulate park operations.