While I agree that these women are that much stronger, tougher, better than any of the ones I sparred with, Francis Ngannou is also at least that much stronger, tougher, and better at fighting than I ever was, so I think it's relatively similar and comparable.
And ya, I've rolled around with some feisty girls, and my wife is no exception... but then again I was always just playing around at probably about 50% effort, while they were pretty much going near a 100% trying to prove themselves, and I still found it very easy to wrap them up with little effort.
I've never in my life really struck a woman full blast with intent to fuck her up like that, but when I imagine it it's not pretty. If I imagine someone like Ngannou taking a swing, I can literally picture broken necks and jaws hanging off their faces, it's kinda terrifying.
I think the problem with your thinking is the illusion that these 8 women will somehow work as one cohesive unit with one mind and plan. I'm guess you picture them forming a perfect circle around him and all attack at once, while he just stands in the center like a scared animal. But in a realistic situation this is not what happens. If he's told what the rules are and he is aware that these 8 women are coming to kill him, I think he would make very short work of them.
You have to also take the psychological effect into consideration, how do 7 women react to seeing him break one woman's neck in the first 3 seconds of the altercation. Men and women are very different, and it goes beyond just the physical.