Hmm. I thought this was something completely different until I read the article. I thought it had something to do with helping people with vertigo retrain their eye movements.
As with many psychotherapy modalities, some work better for some people than for others. This sounds like a relatively harmless treatment, and if it helps people get through traumatic experiences without so much stress and additional trauma, it can only be a good thing. I don't see any way it could harm a patient, so there's no reason not to try it if a therapist feels it could prove beneficial to the patient.