CUSMA, as we understand it, ensures that the 70% regional aluminum rate applies in two cases. In the first case, the rate applies when an automaker purchases its metal outright or purchases the metal for a processor that uses the metal for the automaker. In the second case, the rate applies when the automaker ensures that 70% of car parts were manufactured in the region.
In other words, either the automotive producer purchases its materials outright, which isn't the way that the market works, or the producer makes sure, through its suppliers, that the parts were manufactured here. We're talking about the manufacturing of the parts, not the manufacturing of the aluminum. It's not the same thing.