Er... running that story through Google, it's from a page named 'mythology' and the author says they're old stories he heard from someone who was there.
I heard a story about a guy who killed a thousand guys with a donkey's jawbone. Now that's some lethal stuff.
Uh, yes, if you hit someone solidly in the throat with even a short blade, it's going to be a problem. However, most other places, they're not going to be incapacitating and certainly not lethal. Pretty certain I've said this already. Most of the body is quite tough, and an inch long blade won't collapse a lung or nick an organ. Also, as far as lethal martial arts go 'great against someone not wearing a small amount of padding' is a bit shoddy.
FURTHERMORE there is a society called the Freemasons who are very secretive. I conclude from that they are lethal in combat. Conversely, everyone knows about nukes. They must be rubbish.