That guy in the vid should find himself a hemmeroid cream as a sponsor after seeing all the straining he was doing during those maneuvers
However on a serious note I too wasn't a fan of aeros however I believe it should be taught at a very early stage in your flying training. It is part of the full flight regime and gives you so much more confidence in your own ability, and a better understanding of what is going on. If done early it will also remove the stigma that often comes with aeros and U/A.
I believe that Bob Hoover was a big advocate of teaching aeros early in your training. When he learnt to fly that was the way it was done.