The step 5 of Swing Box method "Step 2 - Prepare the SWING Environment and Replicate Production to SWING" says:
5.Execute the stored procedure in SQL to fix the orphaned users which are created when restoring a database from one SQL instance to another. Example: sp_change_users_login 'AUTO_FIX','ServiceDesk'.
Is it necessary to address to fix the orphaned users on the Oracle server?
No, you do not have to follow the step 2 - 5 "Execute the stored procedure in SQL to fix the orphaned users..." on the Oracle server.