I haven't seen the programme, but I'm not a fan of Sue Perkins.
I know a little bit about India as younger son and family live there. They live on a mountain though, not in a big town. I've had two long visits there.
Even so there are hygiene problems, especially drinking water, as contents of toilet etc go straight into a river. From which the drinking water comes. DiL had typhoid fever once. (Or cholera? not sure.)You have to purify every drop of water.
In the villages the poverty is such that they allow girl babies to die, and also help the elderly on their way out.
They have a small house surrounded by conifers and there are herds of wild cattle which are allowed to plod and poo all over the place. Called gaur.
The most striking thing is the gulf between the rich and the poor, as others have said.