Again, do you believe that there are documents, of any value, that humans don't understand?

There is no value in an undeciphered document until understanding is achieved, just as a lode of gold ore in some asteroid orbiting a distant star has no value until we can fly there and extract it.

If an LLM can help us understanding something then it was not incomprehensible, by definition.

But this is just arguing over word tenses. You think "cannot", they think "could". Somewhere between there is the actual crux of disagreement.