Might be just me, but I don't think I do what they're talking about in that video. That's not how I look at my training. Anyway, too far off topic.
Elbow power in aikido, to me, is something different than what's in that video.
Now the great unlikely-to-ever-be-fulfilled mission of this thread is: can you tell us, to some degree, why it is different or what it is that makes elbow power in aikido different from that? I realize some people wish to keep cards close to their chest, but throw us a few bones, or bone shavings even.