Stripped of connotations, "race realism" to me implies the belief that empirical clusters exist within the space of human diversity and that they map to the traditional racial classifications, but not necessarily that those clusters affect intellectual or ethical dimensions to any significant degree. I'm not sure if there's an non-euphemistic value-neutral term for racism-1 in the ancestor's typology, but that isn't it.

(The first thing that comes to mind is "scientific racism", which I'd happily use for ideas like this in a 19th- or early 20th-century context, but I have qualms about using it in a present-day context.)