That’s not true. It didn’t have access to the internet and no LLM has the fidelity to reproduce code verbatim from its training data at the project level.
In this case, it’s true that compilers were in its training data but only helped at the conceptual level and not spitting verbatim gcc code.
How do I know that? The code is not similar to GCC at any level except conceptual. If you can point out the similarity at any level I might agree with you.