While this is an interesting debate on who did what when where- the point of the video is much simpler.
When people pick something up (sticks knives etc) and try to hurt you with those things, they most often swing them overhand or thrust them into you. Sure there are specific techniques for these, and these specifics do have their place. But the general idea presented in this video is that Aikido has defenses when people try to hit you on the head with something, or thrust something into you.
These attacks are timeless and culture-less, they are simply the gross movements used by man when he is using a weapon on another man.
This is a really good thing about Aikido, but it is not the whole answer to the question you pose in the title of this thread.