Separate concept. Whether something is knowable is separate from whether it is known.
Whether God exists is scientifically unknowable. The shape of a black-hole singularity is currently not known.
No, it's the same - because an LLM is not a God. It is not an unknowable. There are very few unknowables.
No, it's the same - because an LLM is not a God. It is not an unknowable. There are very few unknowables.