If you are viewing text in a small font size, the only way to miss the tremendous difference is if your seeing-eye dog is looking the other way.
Approximately recreating the experiment & looking at my iPad 1 and iPad 3 side-by-side, showing the home screen with a fairly plain background, held at (about) my waist level while standing up, I can only just see the difference, and possibly wouldn't if I didn't know what to look for.
Change back to my normal background - a woodland photo with lots of detail - and its night & day between the two.
So, yes, the test was a set-up.
However, what is also true is that, with the screen off, anybody who can tell the difference between a 2 and a 3 must be a graduate of the Zen-Nippon School of Chicken Sexing.
I know the idea of adding go-faster stripes would make Steve's angel weep, but maybe they should have included some sort of visual cue...