An immigrant _tenured_ professor in Canada got suspended for saying that Canada is not racist on her blog. Was she being a dick? Does she deserve the “consequences”?
At what point do we stop saying “oh these are isolated incidents and not a trend”?
That being said, I do think that there are circumstances in which being "canceled" might not be warranted. I have not heard of the case you are referencing specifically until just now. I read the article and found the prof on RateMyProfessor and overall they do not seem like a shitty person, however I would still like to read the "confidential" report the school conducted even though that is probably not possible as that might change my opinion. Also I am not Canadian and most of the Canadians I know/have experiences with do not outright strike me as racist. Of course current trends I have seen in both the US and Canada have lead me to rethink that people/areas are not inherently free of racial prejudice and if Canada has a somewhat similar history to the US, there is most certainly a bit of racism.
I digress, I think canceling can be a problem for situations like the one you referenced and I do not want to undersell how shitty it can be for someone who is on the wrong end of it. In some cases in may be warranted if the proper mechanism for fairness or recourse are not working. I guess it just kind of depends.
Supporting the idea that you (individual, organization, country, whatever) are not racist makes it convenient to ignore efforts to combat racism ("why should we combat racism when there isn't any") which should be universally supported.
So yeah she was being a dick. As a representative of Mount Allison, they decided her behaviour was problematic, which they are in the right to do. Just because you're a powerful person with a fancy title doesn't make you immune from consequences of shitty behaviour.