It's not so banal as a modification of tariff rates. It signaled a thaw in China-Canada relations that have been poor for a decade, and a willingness of Canada to break with the US in their protectionism with China.
Tesla is now sourcing Model Y (their main seller) from their Berlin factory for the Canadian market.
We might see some vehicles from China in Canada. It's possible they switch Model Y back to China, or maybe just some of the variants that are produced in China (their 7 seater long wheelbase...
The stories you hear about doordash shoppers telling customers that Walmart doesn't have milk or cream of any kind, and get spanish onions when people order pomegranates.