I haven't heard anything about this so called rule and I couldn't find anything that says otherwise. It's wrestling not La Liga
Yazdani uses the orthodox stance (left leg forward) whereas the majority of wrestlers use the southpaw (right leg forward) stance. Generally wrestlers use their 'power' leg as their forward foot. Anyway, the lead leg of the opponent is closer to him as a result. Plus he just has great footwork / quickness, which results in those beautiful high level singles.
Here is an excerpt from the official FILA regulation book.
Article 49 – General Prohibitions
Wrestlers are fobidden to:
- Pull the hair, ears, genitals, pinch the skin, bite, twist fingers or toes, etc. and generally, to
perform actions, gestures or holds with the intention of torturing the opponent or making him
suffer to force him to withdraw.
- Kick, head-butt, strangle, push, apply holds that may endanger the opponent’s life or cause a
fracture or dislocation of limbs, tread on the feet of the opponent or touch his face between the
eyebrows and the line of the mouth.
- Thrust the elbow or knee into the opponent's abdomen or stomach, carry out any twisting
action which is likely to cause suffering, or hold the opponent by his singlet.
- Cling to or grasp the mat.
- Talk during the bout.
- Seize the sole of the opponent’s foot (only seizing the upper part of the foot or the heel is
permitted).
- Agree with the match result between themselves.
