by Jonesy Mon Apr 03, 2017 7:36 am
This exercise is a personal creation by Carl de Crée, and features, I believe, in his MSc thesis as per below. To the best of my knowledge it has no official status.
De Crée Carl, The Origin, essence, biomechanical foundations, and teaching and performance challenges of Itsutsu-no-kata [The Forms of Five] ― Kodokan judo's esoteric sixth kata [Thesis]; Rome, Italy: University of Rome; 2012, pp. 1–423.