Earlier quoted context omitted.
Steel manning this argument: Electronic warfare resistant loitering munitions. They would transmit sparse point clouds to the enemy for training. Not saying I support it.
How is this worse than 4k video, in this age of analytical abundance? The steel content of this argument is pretty low; it's essentially 'technology operates normally = national security risk.' Why not ban pencils? You can draw maps or schematics of secret things, plus they can be used to stab people!
There are many more reasons LiDAR kicks ass but none of them have anything to do with why they are doing this.