But does that mean that looking at videos of Ueshiba doesn't say wether this is the same "stuff"? Even if knowing what to look for?
That's about what I am not sure.
Ok, if you observe and research enough videos of reputable guys doing demos, you'll notice a curious correlation and find that they generally do a a) static "can't" move me demos - Ueshiba's head push b) demos where they emit a significant amount of force with little windup - Ueshiba's knee twitch and c) off balancing demos (which can get silly) where the Uke is controlled to varying degrees.
It's common in both the Chinese and Japanese styles.
If you have a good eye, you'll see similar mechanics being used by both (Ueshiba included), the most obvious being "bounce" type movements (which is why I pointed out the knee trick), and mechanics involving the back almost like a spring or bow, mind you I'm really generalizing.
Its here that you can generally see the components for "Aiki" at work and has little to do with the actual techniques involved.
So yes, you can see them on video.