If anything, for India it is the other way around due to the massive informal economy and tax avoidance.

Indian numbers could be fudged, but is out in the bare for financial firms, banks and bond holders to examine.

And yes, India's GDP is probably higher because of the gigantic informal economy. People are richer than their tax documents make them seem.

Apart from the opposition parties, I could not find a single reputed source that says India's GDP numbers are fudged.