"Ghost Update" is not an official term and you do not get a mail. Only the status changes to 'Application/Profile Updated' and back to 'Submitted' in CIC portal.I didn't get any ghost update email, but I logged in and found my status has changed from "Submited" to "Application/profile updated" AOR 19 July.
The status changed to "Submited" after I clicked on "Check full application status"