The Short Version
The claim is well-supported by multiple credible sources confirming that wind energy's variability increases system flexibility requirements and alters capacity adequacy calculations in India, with direct relevance to how resource adequacy mechanisms should be designed. The one notable caveat is that India does not currently operate a formal capacity market — adequacy is managed through tariffs and regulatory planning — so the "implications for capacity market design" are largely prospective rather than describing effects on an existing market. This does not invalidate the claim but narrows its practical scope.