Since when? We don't have any travel restrictions related to covid anymore at all.

It was also never possible to legally keep out a Canadian citizen -- it was explicitly on the TravelCan website that citizens were always allowed back in. I knew a few people who travelled unvaccinated to other countries that hadn't had the travel vaccine mandate and came back; a lot of people didn't actually realise that there was a Canadian mandate, because so long as you weren't trying to go to the US, they still felt free.