Simular but not exact.
I had to look up that exercise and I tried it that was hard for me. Lol maybe I need to work on that one to. It maybe the same thing and the outward flow of urine made it harder not sure just did not feel the same.
But again can't be technical but will explain alittle more.
This excercise he taught me allows me tighten my vagina where my H can feel it hence the milking sensation it gives. I can only do this about 4 times in a row but woman who are well trained in this area are said to be able to make a man orgasm without either of them ever moving.

The only reason I thought of this was the fact that when I was having sex with my H and not putting much effort into it just doing it for him I was not having a orgasm. Which I has always been hard for me and alot of work so I never really put great effort into it. Since coming to the board and understanding that my lack of participation of enjoyment of the act may in itself be unfufilling for my H I have put more effort into my having a orgasm. In the begining it was very hard work. But it seems the more I do have the orgasms the easier it is becoming and the less effort it is taking.

Something else I want to offer as a suggestion you stated your wife does orgasm on occassion with a vibrator. It is the vibration itself that more then likely causing this. And since a man no matter how hard tries will never be able to achieve that vibration sensation. You may want to get a cock ring with a clit stimulator attached. The clit stimulator does vibrate on alot of them. And may make the experience more well rounded for both of you.
Just a suggestion.

Hope you have a good weekend