From ERCC listing on Scottish Chaarity Register their listing says:
In particular the Objects shall be:
5.1 to relieve the distress of women, men, boys and girls aged over 12 years who have been raped or who have experienced sexual violence and of their partners, friends and families through the provision of emotional and practical support, information, advice and advocacy; and
5.2 to advance education, through the provision of information, advice and advocacy, among professional bodies and the general public about the causes, nature, extent and effects of rape and sexual violence against women, men, boys and girls aged over 12 years, and ways of preventing or relieving the suffering it causes.
https://www.oscr.org.uk/about-charities/search-the-register/charity-details?number=SC006208
So if this is the original version of the Aims, ie not lately altered to fit events, then effectively they have not been in breach of their constitution.
So they have never claimed to be women only. So it might depend on what they have advertised as how services are provided.
But yes, are still guilty of falsely advertising the vacancy for CEO as being for women only as per SSE.
And also, as the tribunal found discriminated against an employee.
ERCC say they made a public statement about being trans inclusive in 2008 https://www.ercc.scot/trans-inclusion-statement/
Their services page makes no reference to women only services being available https://www.ercc.scot/who-we-support-and-our-services/
Neither of these 2 pages have dates on them.
I wonder what the women who set up the service 40 years ago would think about this.