Comment by mkl

That story's by non-experts and sounds like it's based on a press release. There were basic components of calculus well before that too: https://en.wikipedia.org/wiki/History_of_calculus

However, calculus proper (derivatives and integrals of general functions, and the connections between them) did not exist until Newton and Leibniz. Other mathematicians made important steps towards it earlier in the 1600s, and if Newton and Leibniz had not existed, others would have figured it out around the same time.