The theory, of which Allah SWT destroyed Somali civilization and Somali nomads were the ones who survived from it, is plausible cause there is no explanation for it.From what archeology has been done we know that Somalia has been inhabited for at least 10,000 years and was the location of the domestication of the "Arabian" camel. It is also the location of the kingdom of Punt, the Macrobians, city states that traded with Europe, etc. And then its dark and empty. Somehow all knowledge of these civilisations disappeared from the consciousness of the nation. Most the cities became abandoned or replaced by new pastoralists. The rest of history from late antiquity onwards is well preserved in oral traditions and written down by foreigners. Yet somehow we have no written script during the middle ages even though we had several before.
It's mind-boggling how this reset could have happened. There's genetic evidence such as a bottle neck over 2000 years ago in the Y chromosome haplogroups. At least 10,000 years of existence as a separate ethnic group but all men descend from a handful around 1AD? Several written scripts found but no one remembers them?There's no fucking way a city written in the periplus of the erythraean sea such as bosaso is now fully occupied by people descended from 1 guy around a few centuries ago. Who don't even remember anything prior to their progenitor.