I really dislike these "if you're criticizing China, why aren't you criticizing X" articles.

international corporate lobbyists, the US government, and international political coalitions influence Canadian politics in ways that are equally–if not more–concrete than the alleged interference of the PRC. But neither the government nor the media has reacted to them with the same vigour.

Investigate them all. I'm not aware of any mainstream commentator who has suggested excluding any of those groups.