That sentence confirms that the writer of that piece is utterly clueless. The NK's have at least a thousand artillery and rocket tubes within range of Seoul, capable of firing (more or less) simultaneously, a couple of times a minute. There is no conceivable way for Iron Dome or anything else to put a discernable dent in that kind of barrage. It would be a tremendous waste of time and effort.
The way to stop a barrage like that is by attacking the tubes that are firing, not trying to shoot down projectiles that are already in the air.
More like 10,000 artillery pieces alone, in hardened bunkers, pre-aimed for Seoul. Bunkers like these, dug into the native granite that makes up the Korean peninsula:
And artillery pieces are dumb weapons, with no guidance or propellant, so any sort of laser version of the Iron Dome will need to have the power to punch through an iron round and cook off the explosive... for tens of thousands of rounds per minute. We could try and hit each one, individually, providing the North Koreans are polite enough to leave their blast doors open after they fire... but we'll have to shoot a missile into each opening, for bombing won't do squat when the hills are made of granite (one of the harder rocks).
This author has no clue as to what the situation is regarding North Korea.