I contacted AC's social media team re the lack of a concierge card and here was their response:
As part of Air Canada’s plastic reduction initiative, the physical Altitude Concierge contact cards are no longer included in the 2020 benefits package. You can however access the Concierge Desk contacts from altitude.aircanada.com > My Altitude > My Profile > Access your digital card (under Contact Information) or through the Air Canada App > Aeroplan (tab at bottom).
Wonder why they didn't think to just print the info on the SE card itself.