This smells a bit like a statement of faith. Digital neurons and neural networks are not the same as their biological counterparts, sure. But it is not an unreasonable proposition that their functions are isomorphic.
Same is true when you compare an actual brain and an AI model.
Yet we have absolutely 0 clue nor proof besides "it feels about right", that's not how the scientific method works.
(Similarly, there is decent evidence that the brain uses higher-dimensional vector representations of concepts in a similar way to neural nets, at least in some parts of it, but again the details are messy and there's not a clear idea of how these representations emerge or how to decode them reliably)