I would be surprised if Disney does not calculate average shoe heights into their height requirements. I doubt that a half inch rubber sole on a sneaker isn't part of their calculation. Otherwise they would be asking kids to take their shoes off for measurements, especially when close.
I do think it would be wrong, however, to put an abnormally large heel on a child to try to sneak them through. But, a half inch sole is probably average.
My computer locks on video so I couldn't see all of Albort's clip. However, it looked like that child was riding in a ride by himself. Do we know that the child was thrown because he did not meet a height requirement, or was he fooling around in the ride (i.e. leaning over the side)? I couldn't tell because of my computer glitch, but from what I was able to see, it looked less to be a height issue than some other issue.