The celts are not one group

[Tenmiles]

I've noticed that with genealogists these days. They don't seem to grasp that race is not culture.

I find this an interesting assertion.
I confess that I don't know a lot of geneticists, or persons directly involved in the field of genetics (only two), but it has not been my impression that geneticists, as such, have a tendency to blur the line between culture (which is a social construct) and heredity (which is a genetic link). I confess here that I am not really referring to "genealogists", as a practice or trade.

Rather, I would expect (and my own, perhaps limited or biased, experiences may play a role here) that geneticists would be fairly stringent in separating culture from heredity in their own conclusions, just as the most effective physicist might make a clear distinction between observed facts and any philosophical/religious speculation of the meaning of those facts.

Perhaps we have an issue of mismatched nomenclature; where one group of observers uses a word, such as "celtic", to explicitly refer to an hereditary (genetic) link, whilst another group uses the same word to refer to a cultural (social) link, resulting in some ambiguity about the meaning of such proclamations as this "headline" we're discussing now.