The Indus Valley peoples might not have been "white" in the modern sense, perhaps they had darker features. But they clearly weren't the same as modern jeets, as evidenced by the fact they did build a civilization. Notably. the Indus Valley Civilization did not cover most of modern India, it was in the far north and a lot of it was in areas now part of Pakistan and Iran. Don't take that as me simping for Pakistan- ethnic groups thousands of years ago were not distributed the same way they are now, that area was objectively far less jeeted thousands of years ago.