The way I like to explain it to people is that culture, ancestry, and language are 3 separate (but related) things. Knowing one doesn't necessarily tell you any

The way I like to explain it to people is that culture, ancestry, and language are 3 separate (but related) things. Knowing one doesn't necessarily tell you anything about the other two. In this case, it would tell you that the genetics are not sufficient to describe the categories of Roman ethnicity without additional justification that in this one particular case, they are.