Once you are confortable with the 2 pre-requisite tricks, this one should not be long to learn.

make the right stick swing like the video.

Holding the diabolo with your right hand, place it on the way of the string. The stick you make a turn around the diabolo, and thus make a "external wrap".

The right stick is still swinging under the diabolo.

When it goes to the right, throw the diabolo with your right hand with a spinning movement.

Then take the left string, pull it up as for a wrapped mini-genocide.

The stick unwrap the diabolo, and make a genocide.
Take back the flying stick with your right hand after 1 turn around the diabolo.

Unwrap it as simply as you can (you may have a "internal" or an "external" wrap).