Is a nut shot cheap in Kumate?

Why did Frank Dux have to resort to such cheap shot to win? This only emboldened future fighters like Kongo and Hackney to attack the groin. Where is the honor?

Nigga threw sand in his eyes ...

ShotgunSurgeon - Nigga threw sand in his eyes ...
There is no historical record of this. Cheap win IMO.

When he fought the Sumo?

No rule against it? Fair game. Hurt them any way you like to make them say "Matte".