That's true for all West-Eurasia when you ignore the groups with really notable SSA ancestry. So it's deceptive to frame it like that. The thing is, SSA components are very divergent from Eurasian components due to the Eurasian bottleneck and some SSA components are also very divergent against each other so Somalis and Tigrinyas being even 5-10% different on the AEA ancestry scale exaggerates distance outputs using something like G25 or distances based on Fst.
In reality, Somalis and Tigrinyas are literally made up of exactly the same things within the last few thousand years, just in different proportions but Greeks or Italians, for example, have significant post-Neolithic MENA roots that say a Swede or a German or an Englishman simply does not. Ancestry that can make up as much as 20-50% of the Greek or Italian's roots within the last 1,000-4,000 years that is completely absent in that northern European and you can't tell based on "distance" because, again, Eurasians in general, especially West-Eurasian aren't that drift ed from each other even if some of their components haven't shared roots for thousands of years.
Hence how I laid things out a while ago in
@Apostle's thread:
Two groups can be diverged as deeply as 40,000 years and register low "distance" and be diverged as recently as 1,000 and show high "distance". You make too much of distance scores over actual ancestry proportions, walaalkay. Part of why you thought those Pastoralists were identical to Somalis when they're not but more on that in my future post that's pending.