That does not mean that they can keep up the rate of manufacture with the rate at which Iran can supply cheap rockets like Kassams. It's a little matter of cash flow and a sufficient supply of skilled labor.
There’s a post on FR that goes to an analysis of the Israeli vs. Iranian expenditures. The Iranian’s cost are far more than the acquisition cost for the missile since the transport/smuggling costs make for an expensive multiplier.
The Israelis are benefiting from an economies of scale operation that spreads the developmental costs over an ever increasing number of missiles. IIRC, the Israelis are approaching $1,000 per missile. The efficiency of Iron Dome is also increasing.
The Iranians are in a situation similar to when we put the USSR in a tough cash flow situation which led to its breakup.
The Iranians are also in a race with the Saudis. Unless they can get their nukes, basic economics has doomed the Iranians. Hamas needed the ceasefire to get more missiles from Iran.