The way I read it is this. If you live in area ,and can prove it to an officer, you are allowed to enter and leave the designated area.
If you don't live in area then police officer can order you to leave.
So ,in theory , police could put officers around the boundary asking people to prove they live on estate.
If say someone from estate went to Carnival and after invited a few friends back the officer could refuse them entry if they didn't reside on estate.
You don't even have to be causing any trouble.