Does it? Because they are beaming that energy back to earth, just to a very specific place.

Wouldn't it already then be energy on earth but now it's energy that humans can make use of?

It's a benefit because it's energy that doesn't require releasing carbon to aquire and make use of.

make use of -> convert it to heat. Same effect.

You need energy to do work. This can do work that doesn't release CO2. That's the point.

Solar panels are ~40% efficient. So they capture and beam 40% of the energy, and the other 60% gets reflected away and/or radiated as heat. Reflected energy won't hit Earth. Some of the heat will be radiated to Earth and some won't.