Units are fine. He just said he gets energy as heat in the amount 4 times higher than amount of electrical energy he uses to get it.

It's fine to talk about it in terms of energy as it would be to talk about it in terms of power.

And I'd argue that kWh is exactly the usual way of saying 3600000 joules.

Also name "geothermal heat" for ground heat pumps might be a local US marketing term. In international English geothermal means rather what Iceland is mostly doing. Pumping water into very hot rocks deep below to extract heat. And it doesn't work in reverse because it would be additional work to pump heat into very hot rocks instead of dumping it into the air or into the cool ground 2 meters below the surface.