Wading in...
I think that the Tribunal meant that this version of gender identity theory is extreme.
There are other versions - for example the belief espoused by Hilary Cass - that we all have a sense of being female/male which may be congruent or incongruent with our physical body. That's one (wrong IMO but) relatively harmless version. Being gnc is a possible reason for the incongruence but no social transition, medical or surgical pathway is advised except in very extreme circumstances. GI theory is a good name for this belief and this might pass the WORIADS test, IMO.
However, there is an authoritarian version which asserts that gender identity is always more important than sex, that everyone has a gendered soul and must believe that they have a gendered soul (except for the people who are allowed to be gender fluid etc), TWAW, TMAM and no dissent is tolerated, trans privileges trump women's human rights. This is the dominant version. This is the extreme version and Sloejelly is absolutely correct that this extreme version, which amounts to an ideology, is the version being pushed in schools and our national institutions and which attracts the dangerous personality types. This does not pass the WORIADS test. And absolutely, Prevent should be involved.
Edited to bold Sloejelly.