Keep in mind here that at the end of the day it's the importer who legally pays these tariffs. We can't tax some entity in China simply for jurisdictional reasons.
The idea here is that if this does affect China somehow, the importers will say, “Well now, I have to pay this tax, I'm not going to buy from you”, or “If I am going to buy from you, you're going to have to lower your price.”
Keep in mind that we're only 2.4% of China's market. We don't have a lot of clout in China. It's going to be difficult for Canadian importers to go to China and say, “Hey, lower your price because now we have to pay these tariffs.” The Chinese are just going to expect us to suck it up.
At the end of the day it's going to be Canadian importers, retailers, and consumers who are paying these, not entities in China.