I was about to post on this. Either he is misrepresenting his taxes to make for a good story or he had a terrible accountant that had him pay too much in taxes.
Contrary to popular (conservative) belief, when you go up to a higher tax bracket you are not taxed on your entire income at that rate. It is only the amount in that bracket that is taxed at the higher rate. His taxes should be $48,663 not $91,245. If he was already making above $183,250 from other income then, yes it would be taxed at that higher rate. Although you can't distinguish between the income that was taxed at a higher or lower rate, so it sounds like he is misrepresenting his tax burden either way.
He does mention for the second year that he is "still at 33%" because of other contract work, so it looks like he just wants to over represent the taxes of someone pulling in a certain amount from an app.
EDIT: Oh, later in the reddit thread he does mention he "saved a bit based on marginal tax rates". A bit, my ass. He paid about half the 33% he claimed -- $42,000 LESS than the $91,245 claimed based on that income. Saying the other income is the income on which he saved the marginal tax and that he had to pay a full 33% on the app income is just disingenuous.
