Read the chart, it says taxable income.

Deductions and other tax games may lower you’re taxable income, but the progressive tax brackets apply this way to all taxable income.

I upvoted because you chose to strike thru rather than delete. Big props for that

It does not take into account a lot of things, namely the many many deductions for qualifying individuals.

Not all people take the standard deduction, this is true before all deductions and similar economic stimuli.