When I hold and taste an apple I know that the apple exists. Not an issue for apples, you might say, but there's plenty of real information that is not written down and is only derivable from our senses. Such as instructions for using car washes, apparently.
Humans are naturally sceptical of descriptions, preferring first-hand experiences because descriptions can be unreliable, misreported, fabricated, etc.
Because LLMs live in the world of descriptions, they lack the dynamic range of credibility that humans have available.
LLMs can only distinguish between fictitious descriptions and factual descriptions. They must map all of their credibility into this range.
Humans meanwhile can distinguish between fictitious descriptions, presumed-to-be-factual descriptions, and actually factual personal experiences.
It's not intrinsic to LLMs being inorganic, it's intrinsic to LLMs being unembodied.