Indus Valley Civ people diet dominated by beef and other meat, finds study

[Naofumi]

Sintashta is the older culture, so I'm not sure how an younger entity gives birth to an older one. Vedic logic?

Look at the post I replied to

Sintashta culture which was part of the larger Andronovo culture

It suggested Andronovo was the parent. While I was in doubt but I didn't bothered to cross-check it.
PS : That's beside the main point of my comment anyways.