The point is that physically sending the gold is not the equivalent sense of the word transfer in this case. There will of course be some differences, but the gold ledger is the best gold analog of a bitcoin transaction.
The question is a matter of trust in the correctness of any such ledger.
Bitcoin only exists as entries in a trustless ledger. The trustless ledger of gold is physical possession of that gold -- that's the only way that you can verify possession (or spend freely) without a mutually trusted third party.
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