Yeah, people drastically underestimate the raw firepower of artillery. The M270 is called "the grid square removal system" for a reason. (Grid square refers to 1km x 1km area.)
Go up in a tall building, maybe to the 20th floor or so. Eyeball a built up area 1km square. Now picture every structure reduced to rubble in an instant. Now imagine 10km square reduced to rubble in just a few minutes.
Quick work for an artillery battery.
https://rarehistoricalphotos.com/shells-creeping-bombardment...
One thing that the video can't simulate is how loud those explosions are. You don't just hear the sound wave, even from a safe distance you feel the pressure wave in your entire body.