In that case, eleven million cars were sold worldwide between 2009 and 2015. This makes me believe that automotive hardware and software don't really get scrutinized at a level necessary to prevent their use with nefarious intent. Perhaps the new potential reality will change this?
Imagine buying a bunch of Chinese humanoids to work at your factory. Now imagine how much you'd have to trust them. Do you? I am not sure I would.
Way back when the first Bamboo Lab 3D printer came out, I supported their project on Kickstarter and got a few of them. When delivered, we learned they had to connect to the Bamboo (Chinese) cloud service for everything, from printing to software updates and more. Returning them was not possible. We sold them all and got rid of the potential exposure.
If those Chines cars are sold in US or Europe then yes, they do have regulatory oversight.