1) Ok loan words exist in every language, they are not part of the language because they are borrowed. They do not add to or change the structure of the language. Language is made up of the structures of sentences, sounds , the rules etc. Morphology, Syntax and Phonology which is strictly Cushitic branch of the Afro-Asiatic language family native to the Horn.
2) Culture is not static, but when you mark someones culture you look at what is shaped by locality and geography. In terms of social structure(clans), In terms of dietary habits ''Which is camel milk and meat'', Life style(nomadic) ,social norms, ethos etc. There are things in our culture that are very instrinsic to us and some more are less influenced by trade and locality.
3) There is no human group on earth with no Admixture, the admixture in Somalis are not recent they are prehistoric. Pre-Somali ,Pre-Groups forming themselves. What dont you understand in 6000 years ago there was no Somali, we weren't Somali back then. So you cannot project modern perspective into ancient history. I have never said we don't have admixture since most group have it or that we are first human beings.
What i'm talking about is the ''Genisis of the Somali people'' and not the origins of human kind.