Why mention insolation that only penetrates centimeters, when you should take into consideration what the "173,000 TW of incoming solar radiation" does as a whole?
Because the rest of it has nothing to do with Earth's internal heat.
If so, it wouldn't make sense to mention insolation and nothing more. Insolation is described as sunlight penetrating centimeters, as if it is even mildly fathomable that sunlight hitting the ground would penetrate through the crust.
Fossil fuels that store and condense solar energy, on the other hand, get buried deep underground and must get subducted as well as getting buried ever deeper in place over geological time spans.
As such, it would make sense to have some explanation of why that sedimented, stored energy doesn't reach the interior. I.e. what happens to it if it never makes it to the mantle or further down?
It can't all come up as volcanism, can it?