The reason why we have a lower Western Eurasian admixture than other Horners is because ours is ancient(thousands of years old) whilst Amharas/Oromos/Afars all have recent Arab DNA(less than 1000 years ago).
As you can see, we are 97 % Cushitic and only 3 %
NEW West Asian.
Xamir Agaws (Afars) are 16 % NWA, Tigrinya are 24 % NWA, and Amharas are 23 % NWA.
The red (J) is Arab haplogroup. As you can see, even the Gambela who are Omotic have a higher J percentage than us. We are the least mixed ethnic group in the Horn of Africa and one of the most homogeneous in the world.
You can barely see that dark blue, and even it were true, then why do Ethiopian Somalis have Bantu admixture? I thought you said that Southern Somalis had it?