I think this is a major discovery. A molecule that causes fatigue and its found mostly in me/cfs patients and when the molecule (wasf3) was counteracted, the fatigue went away. Countering it seems to be difficult since it has not lead to a cure yet.
This could lead to a test that could positively identify ME or show that its not present. Another thing this could lead to is finding out how exactly it takes away energy and what things could counteract that. This reinforces my view that within 10 years there will be a treatment for most forms of the disease.