Let's say we imagine a dome over the park which is geometrically a convex hull that encloses all the tree tops. Everything in that dome is in the park.

Given that the whole point of the website and the discussion is the fuzziness that any such rule implies, I'm pretty sure they _do_ see the point, but decided to play the interpretation game anyway. What's your point?

Your list of altitudes didn’t go high enough to change the answer. ;) Drones (in the US and the UK) must be limited to 400ft/120m and are still considered “in” the airspace of the ground they’re over. Commercial aircraft flying at 35,000ft AGL are not considered to be in the airspace of a specific park or private property when over the U.S. (and most of the world, I suspect), but they are considered to be inside the country’s airspace, since park & private property airspace has a limited ceiling, but country airspace extends into space.