What are you even talking about. I can not figure out what you are saying, could you clarify? What is the wrong example? The multiple examples in the comment you replied to?
Had the arguments about skin colour in that BBC show not been based on the roman soldier example (which happens to be a very weak example, due to the roman empire being so famous for putting soldiers into places so very far from their origin), Mary Beard, being an expert in roman history, would not even have weighed in.