Yep, indeed i read it as well, there is not enough evidence to claim that for sure, but taxonomy is difficult even for living species on earth today. I thought, let's suppose for the sake of the argument, that Pan are different species.

I strongly recommend "You're Basically The Hagfish of Reptiles..." [1]. It will make your head spin.

[1]https://www.youtube.com/watch?v=xb_pvKbtWd8