You're confused on this issue. Let's get some clarity...
Within the borders of WDW includes wetlands that are designated as protected under *state law."
The state will not allow Disney to build on them, unless.... Disney buys other wetlands elsewhere and designates them as an offset for the protected wetlands within the WDW border that Disney will now build on.
This is a deal given to any entity in the state that wants to build on protected wetlands, all they have to do is buy wetlands elsewhere and have the *state* designate that newly bought property elsewhere as protected wetlands.
Some things of note:
1. To make this deal with the *state*, you have to buy more wetland acreage to be set aside than the acreage you build upon. We saw this when WDW got the protected wetlands between DHS and CBR to be redesignated *by the state* as no longer protected. Now WDW can build upon it (with enough imported dirt).
2. The wetlands that Disney purchases for its offset (which is much larger than the acreage they will now build on) is not contiguous to WDW. They aren't creating a ring of unbuildable land around WDW.
3. This all done with permission (and negotiation) with the *state*. The *State of Florida's Water Management Agency* is allowing this to happen and overseeing it. Every time Disney builds on protected wetlands *within the borders of WDW*, Florida gets twice [or is it 1 1/2 times] as much acreage eslewhere dedicated to wetlands preservation...
4. ... that no one can build on. Not even Disney. To build on it, someone would have to buy it from Disney, and make a deal with *the state* to offset the acreage they're undesignating as preservation with double the amount of acreage elsewhere, which then becomes unbuildable.
5. Which makes it hilariously incredible... and sad... that DeSantis doesn't know this and thinks the state or some other company can be given these outside-of-WDW preservation wetlands and they can build a mall, or a prison, or ANOTHER THEME PARK (!!!). I believe this outside-the-park protected wetlands are owned by Disney and not the RCID, which makes the fantasy of the state or some other entity building upon it even more hilariously incredible... and sad.