Exactly. However I think its a bit more complicated than a grey area. There is just no hard distinction between tacit and explicit knowledge, even though the distinction is useful.

It is not that any tacit bit of knowledge eludes articulation, it is the whole that is problematic. Nothing is truly undocumentable, but its like the specs for microsoft word: its just so much you already need to be an expert to navigate the whole of it.

Thats the distinction and LLM of course of very good at processing vast amounts of bits and pieces.