Which is why I listed it as the maximum altitude and not the highest you can fly from take off point.
The 500 meter rule applies to above the take off point. Tell me, with regulations requiring folks to kep their drones in VLOS, where, aside from a person having someong follow the drone up the mountain side, would this hack be practical for anyone? Is there a person out there who might have a need for it? Already acknowledged as a rare situaion. Not something that anyone following the rules would need in any practical situation. It's essentially a "No, I am not allowed to do it but I could if I wanted to" type situaion. Chance takers. Bravado.
All the same, have fun flying your drone up a mountain. Hope your spotter can keep up.