I did believe I was accounting for spin doctoring by increasing the 0.8% to 20% when I acknowledged different definitions and said "most".
Similarly, that link only takes the federal wage into account - of course it's going to be abnormally low, given there are states with higher minimums. For example, Washington state has a minimum wage of $9.47/hour. A minimum wage worker in Washington won't show up in a study claiming $7.25 is the minimum wage.
Also, where do you mention 20%?