If one person owns all the land, they (or someone they authorize) can boot anyone unwelcome. This makes life much simpler because you can sidestep a lot of issues and focus on what this really is: a pilot project.
Irvine company owns all of the land of city of Irvine. Or something like it.
Details about 10 min into this video: https://youtu.be/sLCHg9mUBag
A bit like Seahaven Island from the Truman show.