I don't think that a simple understanding of some basic physics is pedantic.
The original point was regarding propellers and cavitation. Cavitation occurs in a liquid due to its incompressibility and phase change with pressure. A ship's propeller can cavitate due to the pressure drop on the surface and the resulting vapour bubbles on the surface can cause enough stress to rip metal away. The same goes for the LP fuel pump on a turbine aircraft if you shut it off before the engine has stopped.
A stationary propeller at high power however only risks damage from the increased risk of FOD. It may well be stalled, but thats an altogether different thing to cavitation.