There's a certain year for each car where it's guaranteed to be untrue, and same for each mfg. I don't know if it's 2015 or 2010 or 2005 but I would imagine back around 2000 the vast majority of cars can't be remotely hacked.

I've been telling people that 2006 is peak car for at least 5 years and almost everyone thinks I'm crazy but I just get more convinced ever year.