Huh? I have personally committed production code that was 100% generated by an LLM. Simply because the code was correct and written more quickly than I could have physically typed it out. Does that not count as correct code to you?
I tried it on my/our project 600K LOC (C++), all open source and almost certainly in the training set. Not only could it not explain the questions I asked it correctly, its answers and generated code were absolute jibberish, the sort of thing that would lead to you likely firing the person who gave them to you.