well, there could be other things that cause some kind of internal damage that might not be apparent immediately, and could be treated with modern medicine but they didn't have those options 200 years ago so they lead to a "delayed death". Dim Mak could have a basis in that kind of thing.
He talks about the reverse punch and the myths around that, and he wants to put it within the context of sparring and competition. That's just a different animal, competition/sparring and self defense. There's a lot of overlap between the two, but there are still differences. I'm not a karate guy so I'm not going to talk too much about the reverse punch as far as they see it. But I will say that I believe people today often do not understand how to really engage the full body in delivering a strike. Even Mr. Wallace talkes about the reverse punch being from the hips or the waist. I disagree. It ought to come from the feet and up thru the legs, thru the hips and torso. That's a very different animal than just the hips, it's much more powerful. I don't know if Mr. Wallace understands that or not. Maybe he does and he was just condensing the information for the masses. But the presentation doesn't give an accurate picture of how best to deliver a strike of any kind. So I'm not gonna say it ought to literally be a "one punch, one kill" strike. But I do believe people today for the most part do not understand how to really maximize the power in their strikes. If you do fully understand this, then you realize that each strike has a greater potential than most people believe. You still gotta be good with using it, but if you know how to do it then you've got a better chance of landing it with real authority.
Regarding his points about a woman vs. a man, he's right to a point. A typical man has a size and strength advantage against a typical woman. But a woman can develop her skill to overcome that advantage. She doesn't literally need to become physically stronger than the man. Up to a point, better technique and better skill can overcome size and strength differences. There can be limits to that, but size and strength are not automatically the deciding factors in the exchange.
So there's a couple examples for you.