@CuJoJo@Yotomoe It still has a human physiology, with all the weaknesses that entails. If it gets caught in a joint lock or a choke, it's helpless unless it cheats with strength. Technically, it would be the strongest competitor in the entire tournament without restrictions, but it's not necessarily less 'fair' than fighters like Veronica, who's bigger than actual male heavyweights (for comparison, she outweighs Daniel Cormier by 3 kg and is 25 cm taller!).
That's the problem. Veronica may be a titaness but a good blow to the head and even she would drop on the mat.
This thing is just metal and circuitry, it cannot be intimidated and it cannot feel pain or fatigue, and has no vitals so you can't strike it with decisive blows.
It can also be tuned however you like so you could feed it software to make it as skilled as Morihei Ueshiba and other top masters (think Neo from the first Matrix movie, the "I know kung fu" part).
@pihip Morihei Ueshiba was a human. So was every great martial artist in history. Any perfect simulation of a human must necessarily be fallible. AIs that have beaten human opponents, like AlphaGo, win precisely because they operate in an inhuman manner that surpasses human constraints (in the case of AlphaGo, it can simply cogitate far more potential scenarios and solutions than any person possibly could in a given time). Therefore, a machine fighting like a man is far fairer than a machine fighting like itself with no imposed weaknesses.
You do have a point with a metal/polymer body being much more durable and more taxing to hit, but this is going to be less of a factor in a grappling match. As I stated before, if it is caught in a joint-lock, its human physiology is going to guarantee its defeat.
@ozanty I'm genuinely wondering if 'Parthenon' is going to put a skin on that drone and market it as a 'toy'. Hell, one of them could be wandering around disguised as a human in plain sight and we'd never know...