The comprehensive plan is not like the developer agreement that was in contention here. The Comprehensive Plan is the outline of the development and land management of the property for a period of time. It is not untouchable, nor immune for regular modifications and or exceptions. There is no basis to sue over the board just doing normal board things.
The developer agreement on the other hand was a modification (through overlay) to the process to constrain changes and who would have to consent to them. That was tight, and why it was such a point of contention.
The Comprehensive Plan is more like long term planning for zoning, development, and land management. A framework.. an outline. It's more of a hurdle to do things if it conflicts with an ask, it's not necessarily a commitment to do anything.
I don't subscribe at all to Disney can somehow reneg on a settlement agreement for the board failing to meet secret objectives that are not on paper with the public government.