This story is from Nick Sorter who has the recording of talking with an employee at the institution, who says he checked out.
It is possible to come in and leave incognito, but I doubt it is common.
It is not as if personal medical records of the individual were released. Rather it is simply if he was there.
It may be a hippa violation from the employee, but it revealed no medical info.
Nick says he spent time with his attorney who says it is not violation for Nick to reveal it.