If I had to guess, T-Pain's #s are encapsulating more regions than the US - everything I calc'ed was US-only. It gets really bad when you look at rates in emerging countries so I find it helpful to be very specific about what data is encapsulated in these rates.
Most importantly, while his title is not wrong, remember that this is not what it takes for an artist to make $1, it's how much money is paid out in aggregate for each recorded music stream. Artists make a smaller percentage of that amount, the label typically takes the lion's share.