I found the article really badly written in the sense that it didn't just go through the judgement step by step.
The collections worker said the ruling is “a win for the transgender community” because it “proves that trans people can still win sex harassment claims in their real gender”.
Full article at https://www.telegraph.co.uk/news/2025/10/13/royal-mail-employment-tribunal-trans-woman/
Also at https://archive.is/jvPEt