Hi Saku,
Report RHBAUS01 doesn't clean the indexes of users that are removed from indexing table T77UU. It just lists the users that have still structural authorization (indexes) in the SAP Memory but they are not in the table T77UU. Below you can find the explaination from the report's documentation:
Output
A list appears with those users who have structural authorization in the SAP Memory but who are no longer in table T77UU (Save user data in SAP memory).