It means generated output is based on mathematical relations of vectors that represent words or part of words. I believe pre-language cavemen are intelligent with the caveat that transfer of knowledge is severely reduced. I am even tempted to say that cats and dogs are more intelligent than LLMs.
I'm not even tempted. It's a fact.
To me it merely signals that there are certain mathematical relationships in our language that can be deduced (by neural networks). Nothing more.