You are correct that the published data indicates an overall decrease, just not as much as originally claimed. And you’re of course right to say that a leaked report alone with a general statement regarding poverty increase isn’t necessarily convincing. However, there is a lot of other indirect evidence showing that the poverty problems in India are quite dire today. Massive farmer protests are one example, increasingly volatile political environment is another. There are also lots of articles discussing lack of investment in the social safety net in India. All of this does not paint a picture of a country where there is any meaningful poverty reduction happening.

I acknowledge that there is conflicting evidence in the article I linked though.