If the account is *DISABLED. The user will just not be able to login. It does not remove object rights, and you can still add object authorities to the user profile.
Just an extra note – a user profile is often disabled because of invalid sign-on attempts. If a user tries to sign-on with an invalid password more than the number of times specified in the system value QMAXSIGN then the action in system value QMAXSGNACN is carried out.