I couldn't have explained it more clearly. It's beyond your ability to comprehend.
Incrementally there is no difference in waste heat from electricity generated by fossil fuels compared to electricity generated from solar power. So switching from fossil fuels to solar power doesn't affect waste heat. It's the same in both cases. Which is not true for solar radiation. There is a reduction in the number of photons that can produce heat from striking the surface of the planet with solar power that doesn't occur with fossil fuels. So relative to fossil fuels, solar power will result in an incremental cooling which is exactly what was measured at six solar farms.
If you can't comprehend this I can't help you.