Bit of a surprise to me. Maybe only certain features are helpful for them. But then again, the economist guy is not known to be any sort of intelligent lifeform, he has proven that over and over.
He's talking about using the underlying distributed ledger (the blockchain) as a method of storing Fedwire trades that are currently centralized. ie. using the technology but nothing to do with using bitcoins or creating a new currency.
If they use the idea of gathering transactions in blocks and validating them after a proof-of-work is applied to them, they basically use bitcoin. Not the currency, but the payment system.
We imagined they might do something like that very early in this forum.