Was Victor Hugo's Legal Ankle Lock A Heel Hook in Disguise?

Following Victor Hugo's big win in the final of the IBJJF Jiu Jitsu Heavyweight Grand Prix, questions have arisen over the legality of the attack due to the torque applied to both the knee and the ankle.

Under IBJJF rules, twisting leg locks that attack the knee such as heel hooks are not permitted in gi competition, and some coaches and athletes are asking why this ankle lock variation is still permitted.

Checkmat founder and head coach Leo Vieira posted a detailed breakdown of why he feels the ankle lock as used by Victor Hugo is an illegal technique, yet exists because of a loop hole in the rules.