Right click the property you have bound, and change it to be 'Persistent', and ensure that you save the project with a value of false specified.
Then the initial load in of the page will use the persisted value (false) and only if the binding evaluates to true will it be shown.
Separately, I'd recommend switching to the isAuthorized expression function:
As in:
isAuthorized(true, "Authenticated/Roles/Administrator", "Authenticated/Roles/test_client_sisters")