Well, you did claim that "R1 peoples were Negroids" and that there's "no other available explanation." Just saying.
Having darker skin than modern Europeans doesn't equate to being "Negroid." Per your own source (Wiki): "As dark skin is also relatively common in human groups that have historically not been defined as 'Negroid', including many populations in both Africa and Asia, it is only when present with other typical Negroid physical traits such as broad facial features, Negroid cranial and dental characteristics, prognathism, afro-textured hair and neoteny, that it has been used in Negroid classification."But logically, it makes no sense for Mesolithic European I2 people to have dark-skin while R1a and R1b individuals in Mesolithic Central Asia have fair-skin.
I don't know why you're so needlessly condescending.