It comes down to willingness and intent. If you have a country whose interests can, at times, be hostile to ours and they have the capability, it's a question of whether they want to or not.
The one thing I would say that should be more concerning is that it's not just their own manufacturers that they can compromise. The Chinese nation-state hackers have been running amok through telecommunication networks in Canada, the United States and the western hemisphere, as far as espionage goes. They can be everywhere.
The bigger point I was trying to emphasize as well is that if we don't secure other vehicle manufacturers, they're going to hack them too. It's not an issue that's just exclusive to the Chinese brands, and it's not even an issue exclusive to nation-states themselves. There are the corporate interests that may or may not align with Canada's national interests.