This only work if what you found on Google Flights is search-able on AC Website. Usually it is those multi-cities search result on Google Flights.
Thanks for the clarification. Thought it was too easy to be true!
However, in this particular case with the discounts being restricted to AC flights is it not possible to search the AC website to build a multi-stop itinerary to cover all valid destinations served by AC only?
(My test on GF was YSB-YYZ-YEG-YYZ-YAM)
I'd love to know if I can do more on GF than on Matrix other than link to AC to buy!