So if China attacks Taiwan and NATO intervenes, how Canada will ensure BYD will not remotely brick the charging infrastructure or will not make cars suddenly speed up and crash into oncoming traffic?

From Canada's perspective, China is willing to cooperate even through conflict, and the US is literally threatening to invade.

Same question, but for Tesla and the proposed US invasion of Canada.

(one of those things which the POTUS says that we're all told shouldn't be taken as serious or real, as if that wasn't a massive disqualification for him)

We already have US threatening to invade for absolutely no reason while the American people stand by and keeps arguing about the scandal of the day, I think this argument has sailed for Canadians. The US is now a very unreliable business partner, nothing else.

We can get fucked on both sides but will do business with those that don't want to destroy our economy.