Yes, but he's talking about "trades" there, that's why I don't think merged mining applies.
but specifically about a trade between merged mined chains: Bitcoin and BitDNS. You would have to know already that Satoshi suggested BitDNS as a use case for merged mining. Therefore he does actually mean a trade between merged mined chains.
Maybe he had a more general meaning, but that's my understanding from the context of the BitDNS discussion.
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