The material was available. The operation to capture it wasn't.
Secondary aluminum is not a scarce commodity. Getting it into a high-volume casting facility at the right chemistry and the right price is a different problem. It's not just a procurement problem, it's an operating problem that requires expertise.
Sourcing qualified material, sampling its chemistry, processing it to a blending specification, warehousing it, and moving it are five distinct disciplines. Each requires its own expertise, its own systems, and its own working capital. A casting plant is built to cast. Standing up a commodities operation from zero to serve a single input line was operationally unjustifiable, the headcount and market knowledge required could not be recovered against the volume of one facility.
What the plant was up against:
Scrap prices move daily by alloy, geography, and chemistry, with no real-time visibility into what any given load should cost
Material quality has to be verified before it can be priced, and verification requires sampling infrastructure.
Meeting a casting spec by purchasing to that spec means paying a premium for grade that blending could have produced more cheaply.
Warehousing, logistics, and quality control sit with different intermediaries, each extracting margin.
No turnkey pathway exists between a generator's material and a plant's specification.