Is GeoExchange actually Geothermal?

GeoExchange is basically when heat pumps are used to transfer natural warmth and coolness to the home. The heat pumps and coils are usually placed around 5-10 feet below ground.

According to Wikipedia, “The energy originates from the sun: none of the energy originates from the centre of the Earth, in spite of the name “geothermal heat pump“. Genuine geothermal energy from the centre of Earth is available only in places where volcanic activity comes close to the surface.”

My question is that actually Geothermal energy? Does Geothermal energy only include technologies that include heat sources from the mantle and the Earth’s natural volcanic thermal energy?

I need a knowledgeable answer. Not something from Wikipedia because I’ve read all the stuff there already. 10 Points to the first best answer.

This is for a project and I need to list the ways geothermal energy is “harvested.”