Not true.
If you read the article, you'll find a graph which shows the fractions of income: https://assets.bwbx.io/images/users/iqjWHBFdfxIU/itOyNXaN9ah...
The top 3% of US taxpayers had a combined ~28% of income. You have to go up to the top ~12% of US taxpayers to accumulate 50% of income.