WWJD
It sounds like a bad/unenforceable rule doesn't it ?
The minimum height should be regulated by the required physical features on a production bike, otherwise it is a joke.
For all other bikes it should be a minimum for the purposes of safety because at the lean angles you might experience while underway, you don't want anything to touch the ground except the tires.
Exceptions to that mean you both have to get lucky and I wouldn't want to bet a crash won't result and jeopardize the whole of the program.
Sometimes you don't get what you pay for.
