Right, he is comparing the total usage of the network including externalities. But not on a per-transaction basis, since that would be meaningless, as the trans

Right, he is comparing the total usage of the network including externalities. But not on a per-transaction basis, since that would be meaningless, as the transactions per second can be scaled arbitrarily with almost no change in energy consumption. The problem here is not about including the externalities (although that is an important thing to consider). The problem here is that it is a mistake to look at the value only in terms of transactions per second when transaction rate is just one factor by which you can judge a monetary system. It's not necessary for Bitcoin to compete with other monetary systems in terms of transaction rate for it to be useful.