Race exists at the genetic level.
Gene expression produces recognizably distinct human populations.
Populations are different based on genes. For millennia populations were largely isolated and henceforth became distinct population groups. It would be impossible for different populations in different environments to be exactly the same.
To deny race is to deny genetics. To deny race is to deny science. To deny race is to deny reality.
Race is an undeniable scientific fact.
If you want to argue race shouldn't matter or we should ignore race or race we shouldn't use to judge people, that's a different issue.
Pretending race doesn't exist or race is a social construct is a foolish game of wanting something to be true which isn't true.
People who talk about 'diversity' are often the ones who deny the reality of race. In regards to humans, race is diversity.
Consider the point made in the footnote that I linked in that post.