Just because the plastic door panels don't rust doesn't mean the metal frame underneath isn't.

I can send you a picture of the undercarriage of my 2014 car

That is from the UK. The UK has no idea what rust is or what salted roads are.

I've rusted through multiple cars (also in the North East) in the last 20 years while a friend still has his 2006 model year car in pristine condition with regards to that and is debating whether to buy a new one coz he finally wants to take advantage of some of the advances since then but he can't justify it coz it's still fine and costs him just a few hundred bucks in normal maintenance.

The linked article is hardly an exposé of advanced materials research...