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I believe the comment is referring to the part of the report which explains the 3.4% figure is based on taxes paid relative to net worth growth. Specifically, it says :

“As we showed last year, the richest avoid income when they can. Then they pay very little in tax when it’s measured against their growing wealth. The top 25 wealthiest Americans got $401 billion richer from 2014 to 2018, but paid just $13.6 billion in federal income taxes, a “true tax rate,” as we called it, of 3.4%.”