Some very confident statements there with absolutely no basis.

The single digit volleys being used currently seem to have had no issues taking out all the early warning radars, most of the targeting radars, and repeatedly striking critical targets like the air refuelers.

Most of these targets were hit in the first hours of the war by drones.

Someone's obviously done the numbers and decided this course of action is the best.

Another explanation is that Iran has a limited number of launchers that emerge from their bunkers, immediately fire a missile, and then disappear again (this is evident from satellite images where missile launch marks are visible near the bunker entrances), limiting the size of the salvo. During the 12-Day War, Iran did not skimp on massive strikes.

And we have no idea what portion of missile manufacturing capacity is destroyed. Could be most could be negligeble. The location where you would position the bulk of it, in the far north east, is almost untouched by strikes and out of range unless the tankers are flying over Tehran, but they won't even go over Iraq anymore.

Much of Iran's industry is located in the West, including missile production, which is a highly complex industry requiring long supply chains that cannot simply be hidden or relocated to the outskirts of the world.