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Is he not just saying that Palmer Luckey’s “idea” isn’t his own — Oppenheimer for example had it before? That’s hardly equating them

The title of the article is "How Silicon Valley’s ‘Oppenheimer’ found lucrative trade in AI weapons".

The implication is that Palmer is Silcon Valley's Oppenheimer.

EDIT: Although, now that you mention it, Oppenheimer is in quotes. I guess it's possible that the FT is being sarcastic.