Mate ! He is just consultin . As he ain't sure . U r right he can't add his spouse once he get nominated .I guess not. If I understand correctly, you have more points without spouse. If spouse added, your CRS is lower.
When you add your spouse after accepting nomination, it means you withdraw your application and re-submit.
Sounds fishy (to be frank, atlest the scenario you want), speak to some consultant about it.