I looked at the code some, there are some app secrets stored and used, so they probably have at least a thin claim.
They can also autogenerate the counter claim so an author just needs to click “dispute.”
I’m sure there are lots of valid dmca complaints against GitHub repos, like any site that allows hosting random files. But I think if GitHub wants to encourage programming, they need to invest and be more proactive in supporting programmers from people like the jerk lawyer at Mazda (or probably some stupid “ip protection” consultant) who filed this spurious seeming complaint.