I can also confirm that it's extremely rare for an exemption to be approved. I was driving well before that law came around, but I know most people don't bother even anymore applying anymore - it's that unlikely.
The idea behind the exemption was originally for eg. low socioeconomic families with only 1 car (so they aren't disadvantaged by the law). But the problem is, it turned into cashed up youths wanting to get around the rules and drive a turbocharged or V8 car.
Depending on which government employee looks at it, if they have 500 other applications infront of them, they will probably just stamp every one with *Denied* without them even reading it.
If you really need the exemption, it could require multiple follow-ups. And as always, you'll be at the mercy and mood of the bureaucrat.
I don't know all the regulations behind it, but I wouldn't be surprised if they question whether someone could afford an inexpensive 2nd car to drive instead. You might have a good reason for an exemption in every other way, but with a $70k Tesla, you unfortunately fail that requirement.