So you concede the point then. The age of humans comprehending things is not coming to an end. And therein lies the rub. When it comes to intellectual labour:

Understanding == Value

If a mathematician produces something incomprehensible then it has no value. It's meaningless. Indistinguishable from random noise.

An AI which produces incomprehensible text is producing no value. We didn't need to spend trillions of dollars on LLMs to figure that out. Markov chains can do that job perfectly well.