I'm pretty sure they're taxes either way.
As I recall, the total tax rate including all types of taxes is almost equal across income groups. Poor people pay a smaller percentage in income taxes but a larger percentage in things like sales taxes.
Note also that 67% is getting close to the proportion of total income commanded by the top 20%, and that's without including other regressive taxes.
The fact that the top 20% pays 84% of income tax is of little interest not knowing how much they make (i.e. they could make 95% of all the income or 35%), how much of a burden the tax actually is (i.e. 83% of not a lot is still not a lot)
note: I made the mistake of quickly scanning the article and then it was paywalled when I tried properly reading it, leaving just the title - which I suppose will be reused verbatim to justify all sort of fancy idiotic discussion in the weeks to come.