DMCA counternotice isn’t an appeal that someone has to judge. As soon as you send it to the provider, they can restore access without leaving the safe harbor (if you are infringing, you are still liable, but the host has fulfilled their safe harbor requirements.)

But this may be some other C&D, the repo owner says they got a “takedown” without mentioning DMCA; there is no reason to assume this means Github got a DMCA notice.