I think you have your dates confused, as the Kerala school was only a few hundred years before Newton, and pretending that what was discovered in India is the s

I think you have your dates confused, as the Kerala school was only a few hundred years before Newton, and pretending that what was discovered in India is the same as what Newton discovered is misleading. If we're crediting whoever first made theorems about infinite sums or derivatives to be the inventor of calculus, then calculus also predates Newton in Europe. A lot of people contributed theorems over the centuries that would now be considered part of calculus. Developing a mathematical framework like calculus is more of a gradual and continuous building of knowledge than a single event. There's a reason Leibniz and Newton happened to independently create calculus at the same time.