> arguably proportionate by income.

That source demonstrates that it’s definitely not proportionate by income.

> the top 1 percent paid 42.3 percent of the total federal income tax in 2020 while receiving 22.2 percent of total adjusted gross income

We have a progressive taxation system on income (for good reason), which causes the high-income to pay far more than their proportional share of income.

Some will argue that they should be paying an even more disproportionate amount, which is fine and we can have that discussion, but it is an absolutely truthful claim that they are already paying a higher than proportionate share now.