Populations can change their language without changing their ancestry (through language shift), and populations can maintain their language while their genetic character changes (through population replacement that nonetheless preserves the language).

The relationship between genetics and language is complex and cannot be read directly from either the genetic or the linguistic evidence alone.

What we can say is that NUE001 almost certainly spoke some form of ancient Egyptian — the language of his time and place, the language of the administrative, religious, and social world in which he lived.

His specific genetic ancestry, including the Fertile Crescent component, did not make him any less Egyptian in the cultural, linguistic, and social senses that would have mattered in the Old Kingdom world.

This is a point that applies broadly to the interpretation of ancient DNA: ancestry is one dimension of human identity, and it cannot substitute for the cultural, linguistic, and social dimensions that are equally real but that genetics cannot directly capture.