We can't explain how human thinking works, and how they produce their (verbal or written) output.

We can explain how LLMs generates this output.

Humans can't be that simple, there must be some ~~divine~~ unique human touch to what we do.

Every day LLMs, running in frameworks that add earlier "thoughts" to the context and iterate, reflecting on their own thought process, gets better and better at doing something even less distinguishable from human output.

The gap gets smaller. The "unique human touch" will always be in the gap.

except LLM generated writing and art is basically instantaneously distinguishable because of the nature of how it works? even LLM code is as well?

You just fly in from astroturfer kookoo town or what?