I have seen many of their results since that Anthromadness post was made and it remains relatively consistent in my experience. 30-40% Somali, 20% Desi, 5-10% Bantu and the rest is a varying mix of MENA~Central Asian ancestries like Iranian, various sorts of Arabs and even Uzbeks. Their Y-DNA is diverse too. Some are G2, some are E-V32, some are J-P58 and so on it goes. They are clearly the result of a wide smattering of foreign, Muslim settlers who intermingled with local Somalis which fits with the oral traditions and historical accounts for towns like Xamar and Barawe. Namely that foreigners came and formed the later medieval settlements with Somalis like the Tunni (Barawe), Maay or Ajuuraan (Xamar), Hawiye (Marka) and so forth. Though some of those towns' Somali groups changed over-time with Xamar becoming mostly Hawiye and Marka becoming mostly Biyomaal Dir, for instance.
Ethnic Somalis weren't urban people that resided in stone towns with buildings only with Arab and Persian architecture, Arabs and persians lived alone on the coast in their own settlements.
In barawa region tunnis were agro pastoralists who prefer pastoral life over urban life they lived in the outskirts of the stone town of barawa although later when they were urbanized they settled in areas adjacent to biruuni and mpaayi.
Ajuran first came to xamar after the fall of their empire , 4 out of the 8 moorsho clans in xamarweyne claim ajuran waalamoge ;
1-Reer Maxamud Eebow
2-Reer Baatay
3-Reer Ibrahim
4-Reer khalafow.
Moorsho is a confederacy named after the neighbourhood which all 8 clans/families reside in.
In the stone town of Marka, the first hawiyes to settle there were a group known as juunji they came around 300 years ago, they're blacksmiths from Hiraab.
Mogadishu, Marka and Barawa were all established by Arabs and persians, no proof of ethnic Somalis or remains of them wether it's graves or masjids built by them or neighborhood or even architecture.