Why this trick should be IMPOSSIBLE ft. Rodney Mullen - Skateboarding Science

So is it just me or does anyone else have the sneaking suspicion that Rodney knew, in some shape or form, the board would never spin perfectly on the intermediate axis without the foot guiding it, hence calling it the impossible? Because it's actually impossible without the foot. 

Here I have been thinking it's been called the impossible because of the foot, when really the flip is impossible without it. Mind blown.