That is a hypothesis. Understand the difference between a hypothesis and a fact. And anyway IVC was not in Arabia..anything east of hindukush was considered a part of traditional Bharat.
Where do you think Jainism evolved from...and lol Jains are some of the most devout worshippers of Lord Hanuman as far as I have seen.
Sikhism originated in the lands that comprise Bharat. Not in the Semitic lands. Hence it will always be Indic in nature.
Because that book systematically and with proof demolishes the myth of Budddhist persection in the hands of the Hindus and explains the political motivation behind those cooked up stories being spread by few "eminent" historians.