Not saying this helps to understand how just on purely legal terms this judgement was reached but ....
" ... the tribunal failed to find that Stonewall satisfied the legal test of “instructing, causing or influencing” the discrimination she experienced, and she lodged an appeal.
The Employment Appeal Tribunal has not upheld the appeal, finding that Stonewall did not act unlawfully in complaining to her employer.
Judge Bourne said in his judgment that Bailey had fallen “well short of showing that if Stonewall either induced or attempted to induce GCC to inflict a detriment on her, the inducement was to inflict the detriment on grounds of her protected belief rather than because of an allegedly objectional manifestation of her belief”.
https://www.personneltoday.com/hr/gender-critical-stonewall/
The bits I've put in bold just dont make sense to me.
And I think as said up thread, a jury would not have agreed a verdict on this sort of word salad, but more on what AB experienced.