Multiple people have coined the idea repeatedly, way before you. The oldest comment on HN I could find was in December 2022 by user spawarotti: https://news.ycombinator.com/item?id=33856172
Apparently, comparing low-background steel to pre-LLM text is a rather obvious analogy.
If you have a thought, it's likely it's not new.
i claimed swyx heard it through me - which he did