Yes, he is a proponant to the "indigenous aryan" controversy, of which i am not familiar with, but most of what his article states is supported by more credible sources...for example the Mittanis having the same gods as the Vedic Aryans, and the Zoroastrian inversion of the daevas and asuras. Also, Louisiana State University is not a crackpot institution
Continuing on . . . for a man considered knowledgeable in the field, I present Michael Witzel, of Harvard University:
www.people.fas.harvard.edu/~witzel/EJVS-7-3.pdf
If you read it, you'll see Witzel's disputes with Kak. Also, for another source (Witzel has been accused of ridiculous accusations), I present:
http://www.iranicaonline.org/articles/iran-vi1-earliest-evidence
Which suggests the possibility that Indo-Aryans were brought in as horse experts, and that explains the presence of an Indo-Aryan substrate in Mitanni.