It's not exactly difficult to come up with a question that's so unusual the chance of it being in the training set is effectively zero.
So far i have asked the AI some novel questions and it came up with novel answers full of hallucinated nonsense, since it copied some similarly named setting or library function and replaced a part of it's name with something i was looking for.
And...
> pretty much
Is it "pretty much" or "all"? The claim that the LLM simply has simply memorized all of its responses seems to require "all."