you're right. the west eurasian source for the naqada gebelein samples was best modelled as hotu iran, which has the highest percentage of basal eurasian ancestry yet recorded. and it's very likely that basal eurasians were autochthonous to north africa according to pagani.

there's no peer-reviewed publication yet, but there's an article from someone who had access to a naqada sample from gebelein. it's admittedly low resolution but this component peaks in the kadruka sample from kerma, as well as in modern-day nubians, copts, and bejas.
revoiye.com/pre-dynastic...