No doubt. But where APs are concerned, you always did lose the discount on the Canadian Resident tickets, even when the original promotion was still in place, because APs were never part of the Canadian Resident offer.
To be clear for OP: Yes, you can upgrade those tickets to an AP. Yes, you will lose the discount. Best option for saving a bit on an AP is to buy a multi-day ticket from a third party reseller like
Undercover Tourist. Choose whatever ticket offers the biggest discount over gate price, and then upgrade at guest services. As long as it's a regular ticket (ie. the reseller is offering the discount, rather than Disney), the ticket will be price-bridged on the upgrade.