[qolop]

I noticed that the dollar value on this page is not income, instead it's the dollar value of the consumption per adult in the family and adjusted for purchasing power parity.

That means that if there are two households in India and USA, and both have an "income" of 1000 USD, their consumption is similar. However it's very likely that the Indian households has significantly less actual income because stuff in India is cheaper. This also means that for goods that cost almost the same around the world e.g. an iPhone would be more affordable for American household.