Earlier quoted context omitted.
Overpopulation is always relative. It means that the population at hand exceeds the amount that existing systems can cope with. You can argue that Indian society is badly organized and that their current population levels and densities could be sustained with better societal systems, but that doesn't quite capture how difficult it is to fix societal systems.
What's easier, improving infrastructure or lowering the population?
But that also has the risk of trivializing the problem. Improve infrastructure is hard, especially in a compromised system.