That’s exactly my understanding as wellmy guess is that the portal is only for confirming in-Canada PR applicants status. It was not intended for overseas dependents from the very beginning. So, when they say the case is closed, it means that your status as in Canada PA has been confirmed and there is nothing to do more here. All overseas dependent matters will keep on resolving through the GC account and until it shows approved the file of your dependent spouse is in process. But to be sure, it's better to call IRCC to try to clarify. Or even email IRCC.ClientPortal-PortailClient.IRCC@cic.gc.ca. and ask what exactly they mean when sending you such a message