why are you assuming that’s not the reasoning the people in the poll have?

Well, you have to read the article/poll, because a large number said that immigrants (as people) are a harm to Canada.

Barely anyone in Canada actually dislikes immigrants themselves

We can agree to disagree on this point. Seeing how hate crimes are up, and that only visible minority immigrants are targeted, I’d say we are far from having a country where everyone likes immigrants (as people).