Were the Harappans Akkadians?

Malati J Shendge, in her book, The Language of the Harappans from Akkadian to Sanskrit, and in other works, claims that the Harappans were Akkadians, and were those described in the Rig Veda as asuras, rakshas, pishachas etc, but particularly asuras.
She finds correspondences between Sanskrit and Akkadian, and explains names of the Rig vedic rishis through the languages of Sumer and Akkad. She says the Harappans may have been multi-lingual, but their dominant language was Akkadian and they were migrants from the Tigris-Euphrates region.
This is a different twist to the whole question of the identity of the people of the Harappan civilisation, and their relationship with the Vedic people [the so-called Indo-aryans]. As far as I know, this theory has few supporters.