Sounds like you didn’t even get your full 30 days. Welcome to the neighborhood!

There’s nothing in the ordinance that gives someone permission to remove a cover from your car. You could definitely make a trespassing case. There’s no way for them to tell from the street if the car has been inspected or registered, and if it’s not in disrepair, then it’s only in violation until you inspect and register it.

They say covering the car is not sufficient screening. They don’t say you can’t cover an unscreened car.

I get not pissing your landlord off, and you should probably just deal with it, but if I owned the place, I’d be making passive aggressive yard signs.