Where and when this fact has been established?
use your brain for a moment.
what is all food production dependent upon? photosynthesis.
what is photosynthesis dependent upon? energy input from the sun.
there is a finite amount of surface area on the Earth.
There is a finite amount of solar radiation impinging upon that surface.
assume humanity develops a method to convert all such sunlight striking all that surface area into the basics of foodstuffs, with 100% efficiency.
this is the absolute hard ceiling.
the fact that there is no way we shall ever approach 100% photosynthetic efficiency, 100% surface-area usage, and have requirements for energy other than food production sets a much lower PRACTICAL hard ceiling, but I don't have all the factors available to make a rough table of factors for you.
That aside, again: use your brain - there IS an absolute hard ceiling which our technical prowess can do nothing to exceed. Factor that in when fantasizing about infinite technical innovations.