The paper that coined the term "stochastic parrots" would not agree with the claim that LLMs are "unable to produce a response that isn't in their training data". And the research has advanced a _long_ way since then.
[1]: Bender, Emily M., et al. "On the dangers of stochastic parrots: Can language models be too big?." Proceedings of the 2021 ACM conference on fairness, accountability, and transparency. 2021.
/facepalm. Woosh indeed. Can I blame pronoun confusion? (Not to mention this misunderstanding kicked off a farcically unproductive ensuing discussion.)
[1]: Bender, Emily M., et al. "On the dangers of stochastic parrots: Can language models be too big?." Proceedings of the 2021 ACM conference on fairness, accountability, and transparency. 2021.