https://en.wikipedia.org/wiki/G%C3%B6del%27s_incompleteness_...
https://en.wikipedia.org/wiki/G%C3%B6del%27s_incompleteness_...
I'm not convinced you can't produce a pretty robust system that produces a pretty darn good approximation of truth, in the limit. Incompleteness also rears its head in type inference for programming languages, but the cases for which it fails are typically not programs of any interest, or not programs that would be understandable to humans. I think the relevance of incompleteness elsewhere is sometimes overblown in exactly this way.
Given the pushes for political truths in all of the LLMs I am uncertain if they would be implemented even if they existed.
I hate when this theorem comes up in these sort of “gotcha” when discussing LLMs: “but there exist true statements without a proof! So LLMs can never be perfect! QED”. You can apply identical logic to humans. This adds nothing to the discussion.