The low-background-steel AI-training-data metaphor predates lowbackgroundsteel.ai and arose independently in multiple places, not solely from Graham-Cumming

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Two independent lines of evidence complicate a reading of John Graham-Cumming as the metaphor's originator rather than its cataloguer and (later) popularizer. First, a directly-quoted primary artifact: a Hacker News "Ask HN" post dated 2022-12-21 — three months before Graham-Cumming's March 2023 domain registration (claim-graham-cumming-registered-lowbackgroundsteel-ai-march-2023-announced-june-2025) — already uses the same "clean source is older than the contamination event" structure for AI training data: "On July 16, 1945, the nuclear detonation at Trinity site ended the era of low background steel... has the same thing happened to the internet?" The poster is pseudonymous and the post drew one point and zero comments, so this is an existence proof of prior public use, not evidence the post fed into Graham-Cumming's own naming choice.

Second, a named secondary account: Rajiv Pant (former CTO of The New York Times and The Wall Street Journal) writes that "while John Graham-Cumming has helped popularize this analogy... the comparison appears to have emerged organically across the tech community," citing artist/programmer Kyle McDonald's December 5, 2022 X post making the same observation independently, and noting "others independently reached similar conclusions around the same time." Pant also reports that Graham-Cumming's own earlier tweets on the subject are "no longer available" — meaning even the claim that Graham-Cumming used the analogy before March 2023 is secondhand. McDonald's own post was not independently read; the specific date and wording rest on Pant's account alone, routed to question-verify-kyle-mcdonald-december-2022-low-background-steel-post.