dont know if there is a specific requirement to hold the Canadian card. I can share that last year, when it wasn’t a kiosk (didn’t know there was), but when it was a table with a couple of folks looking at card, then giving the priority slip, I used my US Amex plat and no questions asked - I don’t think the Canadian and American cards even look much different that one would be able to tell without looking pretty closely.

Certainly, there is no promo of this benefit with the US card, but I believe there are other international airports where an Amex plat can get you to priority security, so I suspect any Amex plat should work.