My understanding is that it says that Siberian dogs populated the Americas at the same time as the first humans populated the Americas. It doesn’t explicitly sa

My understanding is that it says that Siberian dogs populated the Americas at the same time as the first humans populated the Americas. It doesn’t explicitly say whether there were any dogs in the Americas before then, but there may not have been. Regardless, those Siberian humans came from Africa — still appropriate to call them Siberian in this context. For similar reasons, after a time, it becomes appropriate to label those humans after the Americas, and similarly the dogs that came with them.