The fact that there's no clear consensus on most of the questions means they are ambiguous, no?
That also fits the English definition of a vehicle, which includes a bicycle.
except you have just applied an assumption (which is often true) that may not be true depending on circumstances - that the planes were excluded because it couldn't have caused any negative effect.
For example, if the park had been https://en.wikipedia.org/wiki/Sentinelese#Isolation_and_unco... , and the intention was to keep the indigenous peoples isolated.
But this isn't a part of the rule, and it is an interpretation of the rule by the administrator. A different administrator might interpret planes that fly higher than audible altitude would be OK, while another one might consider a visual detection altitude to be a violation. And another might consider no altitude to be permissible (because if they crashed right there, they'd be falling into the park).
That phrasing sure makes it sound like they're not in the park until they fall. Does it occur the moment they hit the ground, or sooner? If ground, then that tells us that the quadcopter isn't in the park while off the ground either; it's above the park.