Here we go: https://www.discovermagazine.com/planet-earth/chariot-racers... - make of that what you will.
https://www.cambridge.org/core/journals/radiocarbon/article/...
It's not that it "matters" in a political or nationalistic sense. That's an error in interpretation of the motivation for this kind of work.
It is important because the more we know about how we got where we are, the better.
Science is useful, if it is not immediately obvious, then future generations will surely find an use for it, as it has happened time after time with mathematical ideas.
I would even say it is you who are putting a modern political spin on this by rejecting it.
For all we know, we might never get a complete picture and there might be many other aspects which we are not aware of behind PIE.
- no horse remains or equestrian objects have been found, anywhere in India for this time period
- solid wooden wheels (shown in the reconstruction) are too heavy for horses to draw, for which spoked wheels were developed in the Steppe
- the shape of the yoke that would be tied to the animals is straight, the way ox carts have, like Harrapan ox carts. By contrast, yokes for horses are curved, to match the animal's posture.
