The math and physics actually works for it; whoever ‘owns’ the moon can actually do that. Robert Heinlein (who keeps looking more and more prescient as time goes on) wrote the novel The Moon Is A Harsh Mistress about it, as others have noted. Lunar mass drivers would be shooting down into Earth’s powerful gravity well and could deliver nuclear class kinetic energy releases without the radiation. Think “Rods From God” but larger and with a longer delay.
Whoever owns Luna possesses the ultimate high ground upon which you cannot sneak up and any attack launched on it can be seen coming a long, long way off.
You need to launch not drop...again he is so stupid he tries to pass as female and Chinese. Pure delusion