The balance of the evidence, as recently usefully reviewed by Shaffer, is in favour of the presence of an Indo-European speaking population during th… - Colin Renfrew

As far as I can see there is nothing in the Hymns of the Rig Veda which demonstrates that the Vedic-speaking population were intrusive to the area: this comes rather from a historical assumption of the "coming of the Indo-Europeans." .. Nothing implies that the Aryans were strangers there.

This hypothesis that early Indo-European languages were spoken in north India with Pakistan and on the Iranian plateau at the sixth millennium ec has the merit of harmonizing symmetrically with the theory for the origin of the Indo-European languages of Europe. It also emphasizes the continuity in the Indus Valley and adjacent areas from the early Neolithic through to the floruit of the Indus Valley Civilization~ point that Jarrige has recently stressed. Moreover the continuity is seen to follow unbroken from that time across the Dark Age succeeding the collapse of the urban centres of the Indus Valley, so that features of that urban civilization persist, across a series of transformations, to form the basis for later Indian civilization. A number of scholars have previously developed these ideas of continuity.

Certainly the assumption that the Aryas were recent ‘immigrants’ to India, and their enemies were ‘aborigines’, has done much to distort our understanding of the archaeology of India and Pakistan.