Don't get the logic here... If a "superstar" researcher at any stage expressed interest in moving to Canada, the university will go like "nope, we're going for our own boys here"?

Well... if talking about really high performers, that wide net is already cast for a really long time... This, conversely, is telling students/postdocs that if they want to have a future in Canada, they have to not be in Canada

Now a PR, I don't really have to interact with them much but upon my first entry into Canada, I faced the most rude immigration officer