F=MA, it will literally have to do with the speed because they're telling us it does. Not only that, Gunnm is not Naruto. Gunnm uses sonic booms and shockwaves frequently to show supersonic speeds. You as well know this because any time someone some like Kaos, a pure human, swings his sword and it's supersonic and the characters say supersonic we see the accompanying shockwave and sonic boom.
Alita reacted to the ball, she has to, to immediately shoot the ball to hit his ball dead on. It's the entire point of a duel. It would make her supersonic, it doesn't mean every single type of movement she makes is supersonic but her limbs are very obviously supersonic. It's a thing you see throughout the entire series for various characters. Whether it's Zekka literally explaining this about speed in last order. (Battle Angel Alita Last Order, vol. 4 Omnibus, Phase 60, 64)
To Alita fighting Caerula, and pointing out that Caerula is subsonic due to lack of sonic booms and shockwaves.
To Toji's reverse thrust being fast and we see the accompanying sonic boom and shockwave.
And more and more and more. The "wiki" should be accepting the terms that the narrative of a body of work has. It isn't there because Kishiro has no clue how speed works, it's because he does.