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This is saying it puts you in the 67th percentile when adjusting for purchasing power, which is still saying a lot.

It says that for a 3 person household. For a single income, it puts you above 90%, eerily similar to the data I presented :)

Does this do cost of living adjustments?

They claim to. Supporting these numbers is the Washington Post link someone else presented with similar results, PPP adjusted.

Raw income and purchasing power are substantially different things.

That site adjusts for PPP, which is why they ask for location.

If it does, it's not doing it very well. Entering $1,000 annual income for the USA is shown as being in the top 58% worldwide.

The site implies that $0.52/hour leaves you better off than "the average labourer in Ghana [making] just $0.08 in the same time".

I've shown three decent sources that give similar numbers. Feel free to post something credible that lets us compute otherwise.

Also, why do you assume a 2000 hour work year is common worldwide? It's not.