A dollar is still a useful unit as "the fraction of the economy that can be controlled by currency". It's true that printing a huge pile of it and throwing it at GPUs wouldn't instantly convert into more GPUs, but it would meaningfully represent that other things are being squeezed out to allocate more resources to GPU production even so. That such reallocation is inefficient, arguably immoral, and highly questionable in the long term versus other options wouldn't stop that from being ture.