Renu,
I skimmed over the paper, somewhat in a rush, so may have missed somethings. But for now am thinking maybe Savarkar's brain was working overtime in the Andaman prison. Maybe Savarkar wanted to tell the missionaries and englishmen that Jesus was a Hindu, Tamil and Brahmin, so he spun a story.
Hence when he came out of prison, he wrote a few things from puranas (unconnected to the topic) and out of nowhere suddenly claims Jesus was Tamil and Brahmin. In the paper i saw no evidence why should Jesus be considered a Tamil or a Brahmin...
I have no idea how Vartak and Savarkar can claim Parawata = Mesopotamia, Kurios = Kurus, Turvasus = Turks, Anara = Wanara, Arava of Bible = Tamil language, Balhika = Baltic countries (btw in Mahabharat the Balhikas practiced Aliya system of property inheritance to nephew), and so on.
Savarkar mentions one scholar from Andhra, and someone named Ramasamy Iyer, both of whom gave Savarkar the idea that Jesus was Tamil and Brahmin.
Some people think aravam = tamil. The use of the term Arava is rather old (in telugu), and imo refers to the languages of tribes such as Irula / Yenadi / thigala, etc, whose languages are classified under dravidian family, but are quite different from other dravidian languages (those interested please look up details on irula arava). This simply shows 'dravidian' is not one single entity. This in no way means Jesus was Tamil.
Regards.