It's part of the deathtrip rites to attack Dr. Hammesfahr. That undoubtedly speaks well of his work with Terri. In fact it was the only good, professional testing we got.
He got in their way :-)
We should keep in mind that Michael wouldn't permit any testing or any therapy. (Terri's last therapy was in 1992.) That way Michael stood to kill two birds with one stone (so to speak). By denying her testing and therapy, he hastened her death and at the same time reduced costs and stood to inherit more of her money when he got her safely killed off.
The results of this therapy have been so remarkable that Dr. Hammesfahr has written and lectured extensively about it and he has invited physicians, primarily based in universities, to visit the facility and observe first-hand these results. These visits have resulted in several facilities beginning to work with Dr. Hammesfahr to bring these treatments to their clinics. His work has been published in the peer-reviewed web based journal, Lifelines, and requested by several major print medical journals for publication.