You're assuming the pay is cash. Most CEO (and high level executive) compensation is stock, which is taxed much differently from salaries. The tax brackets have very little effect.
While you are right (salary, bonus and other cash compensation was $4.1 million, while total pay package is $14.7 million), A) I did write "income (and wealth) tax rate", B) capital gains taxes have also decreased, and C) my main point is that if we tax the rich more, then daenz's question effectively disappears.