This seems to contradict the article, which among other criticisms, specifically says that these drones are more expensive and less reliable than mortars.
He takes into account all the drones that don't work and then goes on and pretends artillery is 100% accurate and has an absurdly low cost (at the price he is quoting, they are basically sending grenades).
Let's not even discuss moving target or penetrating inside fortified targets which mortar will never be able to do.