When Chinese officials apply for a visa to visit Canada, our security officers review the applications because they are aware of the issues we've talked about.
As ambassador, I had a role to play as well. A number of cases come to mind. When we thought, but didn't know for sure, that people might do unacceptable or inappropriate things in Canada, we would refuse to issue them a visa. That happens depending on the relationship between the two countries in question.
It wouldn't surprise me if Canada's officials were stricter in 2020 than when I was ambassador given how much the relationship with China has deteriorated. Nevertheless, those are things that have always been done.