Assuming GitHub isn’t lying, no it isn’t. They claim the vast majority of output is original, much like how GPT3 typically generates original text (although can sometimes output inputs verbatim). If that’s their intent and they haven’t deliberately tried to make their model output it’s inputs verbatim, then they’re good. Remember, there’s a big sampling bias online towards people sharing bits of code that are obvious verbatim inputs - you don’t see all the ones that aren’t.