I do not doubt the numbers quoted in these news reports, but most of the times these kind of news is sponsored. Especially by the people/organizations which are quoted in the news.
Apart from the rise in volumes, we also need to look into that how many new user registrations/KYC have been done in these Indian exchanges. This will give a clear picture, to the extent Crypto investment/trading is picking up in masses in India. I have tried to reach out to different exchanges in the past for this information, but none of them was willing to share it for obvious reasons.
Pls. note Crypto is a very new asset class and most of the educated people also have very less idea as to how to go about it. And then the negative news about government policy on this from time to time only weakens the confidence of common folks in getting started with it.