Nic doesn't say that Bitcoin consumes less power than you think on a per-transaction basis. He says that Visa consumes way, way more if you price in nebulous externalities.
I am rejecting his thesis by saying that if Visa used as much power per transaction as Bitcoin we'd need to generate 3X as much power as we currently do.
The quote is: "Any energy comparison must take the above into account – including the externalities from the extraction of oil, which implicitly backs the dollar."
I'm taking it into account. And I'm saying he's wrong.