The judge relies very heavily on Pasterski's report.
Para 75:
... in respect of the concerns about the early and complete social transition of R and H, and the alleged unwillingness of CP and TP to recognise the long-term implications of such an early transition the evidence of Dr Pasterski compellingly rebuts these concerns. Her evidence in respect of the '2 critical historical misunderstandings' not only explains the approach of CP and TP but provides clinical justification for that approach. Notwithstanding even the Guardian's caution in respect of the openness of CP and TP to the possibility of an alteration in the children's attitude to their gender identity I conclude that Dr Pasterski's evidence demonstrates that it is obvious that neither of these grounds would meet threshold.
From Pasterski's evidence at para 58:
In her report she identifies that there have been recent changes to the diagnostic criteria for gender dysphoria and that research on mental health and transgender children have shed light onto critical historical misunderstandings related to clinical presentation in gender dysphoria. Firstly, that children who present with gender dysphoria are likely to desist in their cross-gender identification and secondly that gender dysphoria is inherently associated with high rates of comorbid psychopathology. She notes both have been shown to be false. She identifies that these misunderstandings arise from two particular factors. Firstly earlier studies which showed that up to 80% of children desist in gender dysphoria included children who presented with gender incongruent behaviour but did not necessarily state the wish to be or that they were the other gender. Thus children displaying gender variance may have been wrongly diagnosed with gender dysphoria. As a result of this treatment protocols previously incorporated a watch and wait approach which had prevented truly dysphoric children from transitioning which had likely resulted in increased rates of depression and anxiety. As Dr Pasterski puts it 'Put simply, many who have shown to desist were likely not dysphoric and psychopathology in those who persisted was likely due to forbidden expression of their true gender identity.'
What is missing from this judgment is the Tavistock reports concerning the older child R, that will have been somewhere in the unabbreviated court bundle.
Para 9:
I have also read large sections of the court bundle in particular the contents of the Core bundle. Even the more limited court bundle that I was provided with ran to 6 lever arch files and I understand the unabbreviated edition runs to many more. ... Given the huge volume of evidence and the extensive arguments which have been deployed this judgment cannot aspire to being anything like a full evaluation of the evidence and the arguments but is confined to what I consider to be necessary and proportionate to deal with the issue that remains in dispute.
The judge's decision hinges on whether this is a case where it is 'obvious' that the threshold for care proceedings cannot be reached (type 1) or whether this is not obvious and the threshold could still be reached (type 2). Only in a type 2 case would he then have to consider whether a full facts investigation was necessary before granting permission for SS to withdraw.
The judge decided, wrt the allegations of inappropriately transitioning very young children, that the case was type 1 - i.e. that it was 'obvious' the threshold could not be reached - on the basis of Pasterski's BS evidence.