I'm disgusted that they are potentially ruining a child's life, by categorising him at such a young age as fact. When it's stupidly hard to diagnos mental issue in much older people. Based on criteria which children exhibit in most things.
"The diagnosis of GID is made by the key workers working with the young person. We will also assess their general wellbeing. We remain in contact with young people often for many years.
"Our aim is not to predict or direct the outcome, but rather to support the young person in their general development as well as develop a trusting collaborative therapeutic relationship in which it is possible to openly explore their feelings about their gender."
Sounds like they are doing exactly what you have described to me.