Things might conceivably change from November 8.
One can only hope.
CBSA stated NEXUS and FAST enrollment centres remain temporarily closed as long as COVID-19 border restrictions are in place.
No idea which restrictions they are referring to. Closed until US open up? Closed until ArriveCAN is deemed no longer necessary?
If CBSA wanted to, it could have done so a long time ago especially at PreClearance locations as both CBP and CBSA were still staffed there performing inspection operations.