> it's the same

No, it’s not. Rumsfeld segregated what we know from what we know we know (and vice versa). An unknown (whether known or unknown) may be knowable or unknowable—his framework doesn’t address knowability.

> because an LLM is not a God. It is not an unknowable

I tend to agree with you. This has nothing to do with the Rumsfeld comparison being wrong.