Its great he helped you, I really think he's on to something, not quite there as a complete method but still very helpful. His basic idea (published in the guitar magazine I linked to a few months ago) that you start off by using your whole arm to play a note as opposed to using the finger is great. It takes the 'pressure off' and takes the focus away from the trouble area that you cannot control. You get an instant result and that's something you can play with and build on.
However, the idea that you can then learn to play guitar using just the large muscle groups, and avoiding the forearm flexors/extensors (which actually control the fingers) is a little far fetched. Playing a tremolo by using the muscles in your armpit? I don't think so.
I like to spot the parallels in the aproaches of people who have recovered or who are having success coaching others back to recovery. Leisner's principle takes the focus and attention away from the dystonic area, allowing the note to be played and to start to rebuild that connection between our sensory and motor skills without interference.
Seems to me that Fabra's success is based on the same principle.
