Here's a vid of Okamoto of Roppokai Daito ryu:
Starting at 0:17 and specifically at 0:27-0:30, could you tell me where the pressure points are that Okamoto is using?
While I've never trained with Okamoto, I highly doubt that he is simply using pressure points to affect his students. I'd believe more along the lines that Okamoto was using Daito ryu aiki.
As for demos ... well, Japan is famous for them ... in more ways than one.
I have no idea what is going on in the video. However, I was listening to one koryu jujitsu person who is very legit from a different style. He stated that he had attended some DR seminars and when the DR sensei stopped the technique he would just stand up ready for more yet the DR sensei's students were still wiggling around. He asked the DR sensei what's going on and the DR sensei said that he had no idea why the his students were acting the way they were.