The court had no choice in the vendor they chose. Since the American Psychiatric Association or any other medical or professional association does not support this type of "therapy" there are no professionals to do it. As for the rest of your post. I get your point. You love the father and you hate the mother. That seems to be a common opinion in this thread.
I believe you are mixing apples and grapefruits. APA has turned down the inclusion of Parental Alienation Syndrome as a diagnosis. They did, however recently include some related diagnoses having to do with disturbed parent-child relationship, or attachment disruptions--I forget the specific terminology. These kinds of changes are seldom speedy--doesn't mean that the actual conditions don't exist.
But as far as treatments go, I don't know that the issue has so much to do with approving any specific intervention being approved per se as it has to do with how and by whom as much as what. Traditional talking therapies are probably sound. But with children we have the compounding issue of things like where they will live in the meantime, how to protect them from being hurt all over again--and meanwhile they are growing and developing while people try to figure things out. Perhaps therapists should be the ones to handle the behavioral aspect of reintroducing family members--but probably a very expensive way to go. I am also leery of the coaching approach--but less alarmed than many, particularly realizing that this is accompanied by what is likely a pretty heavy dose of ongoing therapy.