finally got round to calling cx - apparantly they do pick up passengers in YVR on this flight number, but still won't allow pax originating in YYZ to get off in YVR.
I'm still not convinced, coz the agent I spoke to thought that pax originating in JFK can't get off the plane at YVR either, and I know that they can (coz I did) - I'll eventually call them back, but I'm not too hopeful, coz the segment isn't showing up on itn either.
God, I miss CP!