Using New Outlook on Windows for professional communication and productivity
That is not what this setting is for Jon. That setting is used by the Windows Update process. When an update occures that requires a reboot to finish processing the update, this tells Windows to automatically use the user's credentials to log in and complete the update process (without you having to login first so it can complete) when a user needs to be logged in for completion..
This has absolutely no effect on the recurrence of Windows Mail (running under the "new" Outlook "lite") from auto-launching every periodic time.