Not really. The US attracts wealthy people from around the world, has a gigantic internal market, and is friendly to financial business. If you don't consider the top 0.1% then the picture looks totally different. The VAST majority of wealth in the US is help by people in 50th to 99th percentile range. The Gini coefficient makes the US look superficially more like Qatar, which is obviously nonsense.
It's a little bit funny to say that a metric is skewed by measuring the thing it is designed to measure...