The terms and conditions he stated are standard for obtaining a security clearance. For Top Secret the periodic re-investigation happens every 5-yrs, whereas the Secret clearance requires the re-investigation every 7-yrs (I think).
It’s the first I’ve heard that to get a security clearance, you can’t be a dual national. So no employee with a clearance can be married to a non-citizen, or have been naturalized, even as a child?