I skimmed through the Wikipedia article you linked, but didn't see proof of that. I certainly could have missed it, though. Which part of the article do you feel supports your claim?

Income inequality is a very flower metric to mesure wealth variations.

Imagine country A, awesome with very little income inequality. Half it’s citizens earn 9k a year and the other half 10k a year.

Now country B, is very bad. 90% make 50k a year and the other 10% make 500k. That’s terrible, isn’t it? I wouldn’t want to live in country B.

The bottom 50% of US citizens have -0.2 trillion in wealth. That's right, they are in debt.

Never in the history of the world have the poor had less than nothing.

But smartphones! /s