The concept of a recall for "premature rust" implies there may be one or more parts that need to be replaced. Until they can inspect your car, how could they possibly know how many parts need to be ordered?
The days of just ordering everything that may be needed and use the stuff you need and let the rest of it lay on the shelf for 20 years has been gone since the 60s. Todays warranties are lucky to be able to get all the parts you need to fix the issue, you never can get more then you need, usually you have to scrimp on something.

Back in the early 80s I worked at a dealership. We had to replace a bad rod and piston in a motor. You got the one rod, the piston & pin, the intake gaskets, one head gasket, and an oil pan gasket. We were suppose to reuse the rings and the bearing inserts. You only got the parts you needed to put the piston and rod in, nothing extra.

When you take anything in for repair, to assume they can get the parts, or have them on hand is a pretty big assumptions these days. Ordering parts has really become a guessing game, and if you get the parts, you can no longer assume the parts you got are either good, or even the correct ones.
You set up an appointment to have the vehicle inspected, you bring it in for that appointment and they determine what parts they need to fix it, and order the parts. When the parts come in, you set up the appointment to determine you got the right parts and the repair begins. They are either successful repairing your vehicle, or your vehicle is tied up at their shop until the new parts they had to order come in. Welcome to the new world order.