I mean look at how nonsensical this claim is
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camels were introduced into east africa through the Sinai several hundred years before they were introduced into north africa with the coming of islam.
Yet the east african camel is completely genetically different ?
No but I think its obvious something else is going on since the borana inhabit fhe the traditional oromo homeland and yet the rendile who are small group of tens of thsoaunds are somehow lingustically closer.
This leads me to think that it might be possible these guys are just some proto somali pouplation who migrated elsewhere and thats the cause of the lingustic divergence and not them being some different language that split before Somali was a thing.