In concert with this, I'll note that the fare rules for previously purchased tickets now state the following:

EFFECTIVE FOR CHANGES MADE AFTER 06JUNE 2023
PASSENGER CAN MAINTAIN UNUSED VALUE OF TICKET AS
A CREDIT SUBJECT TO THE CHANGE FEE OF THE FARE
RULE CONTAINED HEREIN. REFERENCE GENERAL RULE 80
AND 85. MUST BE DONE VIA AIRCANADA.COM OR
THROUGH AC CONTACT CENTER. MUST BE ON 014 TICKET
STOCK