I think we have some exercises that train us to feel internal structure and use that structure to create power. My weak theory is under scrutiny, but I'll stick to my guns for this point that aikido does have some internal/core structure training. I don't know if I would go as far as to say it was internal power/strength training.

To me, it seems a big difference comes is the fact that IP people have exercises for training and they know what they are doing and what is the purpose of the exercise. Aikido, on the other hand, has a collection of exercises for what purpose most cannot accurately describe. The fact that we cannot classify anything in the video as internal strength training says that the video does not teach internal strength training.

We are granted a period of time to figure out what we are doing and how to share this information with others. After that period expires we either need to be able to adequately explain what is going on, or we have not yet learned that piece of the puzzle. For me, this argument extends into the "creepy" stuff too. Now, we may be able to label that incomplete training ("spiritual - contents under scrutiny"), place it aside and keep training. For the record, this is one of those holding places for the real "you need to feel this" aikido. We need to eventually open that box and better classify that content.

In aikido, we sometimes settle for vaguery as a satisfactory answer to some of the more heady stuff. "Move your ki" only works as an answer for so long. After a while if you cannot explain to me what that phrase means, I will look for myself and find someone who can. I give exception in this comment to those issues which arrive out of cultural or language miscommunication.

In this sense, our technique has an omote and ura (in the old sense). We can copy what others do and replicate the action; but without the substance of the technique (the "why") we will never learn more that the outer shape of the technique. To really learn technique you need to also learn the ura, the "why" the technique works. Again, aikido seems to settle for simply learning the shape and not digging deeper to make the technique theirs with true understanding of what is going on and the ability to share that knowledge with others.

I think this response may be slightly tanget to the thread, but I thinks it important that we place the proper emphasis on those roles sharing information with those absorbing information.
Freakanomics is a great book that looks into the difference between coorelative and causal relationships. I think we have a lot of coorelative relationships in aikido...