Next he will be wanting a red recording light on it.To answer the question, I believe the hub in the Seagate enclosure is powered. I did not test that, though.
That is probably best considering the OTA dongle is bus-powered. But if everything else connected to the hub, like the EHDs, are all self-powered, I might expect an unpowered hub to work as well. The H+ comes with a power supply, does it not?
He doesn't want to use it. He's concerned about appearances.