A population group need not “mongrelize” to become a distinct group on the chart above - just keep to themselves enough as far as reproduction for long enough.
Notice that “Iranian” is a distinct population group based upon DNA data - as per the chart above.
“distinct population group”
That does not make them a “race”.
“mongrels” are not my words. That’s a cut & paste from W, the source I linked to.
That previous post should have been: “That alone does not make them a “race”, subject to “racism”.”
Looks to me like they’re grouped under 1 of the 5 broad categories, called Caucasoids, along with a bunch of other “distinct populations”.