Copyright notices and signatures in generative AI output are generally a result of the expectation created by the training data that such things exist, and are generally unrelated to how much the output corresponds to any particular piece of training data, and especially to who exactly produced that work.

(It is, of course, exceptionally lazy to leave such things in if you are using the LLM to assist you with a task, and can cause problems of false attribution. Especially in this case where it seems to have just picked a name of one of the maintainers of the project)