Behaviour with GitHub's Email Resolver

At work, just noticed that in one of our private repo's contributors page, some strange user was being displayed. Knowing that it could be simply due to some e-mail appearing in the author's commit or within the very own commit message, I just went around looking for anything suspicious in the timeframe from where the commit mentioning this strange user apparently happened.

After some digging, I tracked down to some commit with the following snippet at the end "Co-authored-by: Copilot <copilot@github.com>". Well, it could be it, but would be very strange if that was the case. So, in my personal account, I created a private, separate repo and tested. A simple commit, arbitrary title, but with a commit message having the exact same string: "Co-authored-by: Copilot <copilot@github.com>".

Again, for this test, I didn't use Copilot to generate the commit or the actual "change", but rather just added this string to the message. The commit resolves that e-mail to the exact same strange user I saw in the collaborators list of the company's repo. It's resolving to this guy: github.com/00sadik-lab.

Can anyone confirm the same behaviour?