the technique is good but extremely hard to pull off correctly. you could do it but not with enough power or accuracy to beat a keeper had they guessed the right way. a keeper doesnt care what foot your hitting it with - they pick a side and dive and hope to get it right.
i would say that even with practice, under pressure of say an important game, only a few attempts would be successful and the majority not.
still its a brilliant penalty and could maybe fool a keeper into diving early or too late.