This hasn't been changed on the official Canadian Government website yet...but here's the first of the media announcements.
Antigen testing for fully vaccinated travellers into Canada will now be accepted as of February 28th, 2022.
https://www.google.com/amp/s/nationa...f9b5e2fc9/amp/






...but may I ask where it says that Antigen testing can be done 72 hours before a scheduled flight?