So, three things:

One: Does this actually prove we haven’t descended from the Aryans? NO. On the contrary, as Tony Joseph puts it, we now know, rather, that we have descended from four people – the Out of Africa migrants, the West Asians who mixed with them and later resulted in the Harappan Civilisation, the East Asians, who came after, bringing Austro-Asiatic languages to India – and finally, the Central Asian Steppe pastoralists who brought Indo-European languages with them.

Two: Can one skeleton conclusively prove a theory for an entire civilisation? No, that would be unscientific.

And three: Does believing we have descended from Aryans – as the British had told us – actually demean us in any way? NO! On the contrary, as Tony Joseph puts it in an interview to HT,