All of that might be true. It's still not the law, and if you've ever been to traffic court, that's all they care about.
Says you. However, with all due respect, that doesn't really matter much when the law says the contrary.
I'd suspect that has a much higher likelihood of succeeding.
Not all traffic court is the same. Parking is often a lot easier to deal with and get dismissed than other types of violations.
Just as an (unrelated) example, NYC laws allow drivers to park at broken meters for up to an hour without getting ticketed. There's even an app that's supposed to help you find broken meters.
My brother goes on tech service calls all day, and he's pulling this shtick where whenever he gets an expired meter ticket (apparently a pretty frequent occurrence), he responds in writing saying the meter was broken and he was there for less than an hour. I don't remember the exact numbers, but he's had better than 50% success rate. And this is despite the fact that the meter usually was not broken at all.
Ethics aside, this just goes to show that they're not always such sticklers on the parking tickets. Obviously there are other times when they can be maddeningly stubborn and strict, but it's definitely not always the case. Basically parking is much more of a YMMV than other traffic tickets.