As I said above IANAL but I wonder about this.
This is from the IHREC
"Discrimination on the ‘gender ground’ happens where there is less favourable treatment of one person compared to another, because one is a woman and the other is a man.
Pregnant women or women on maternity leave are also protected under the gender ground.
Under EU law, a transgender person who experiences discrimination arising from their gender reassignment, or transition, is also protected under the gender ground"
Gender is in the Equality Act but was in it long before Self ID became legal or before gender identity was widely spoken of.
I think the reference to gender was intended as a protection for women and was a polite term for sex. I suspect that there is some uncertainty about the law around the term gender and whether it was intended to protect sex.
https://www.lawsociety.ie/gazette/top-stories/2023/july/ihrec-wants-equality-law-to-cover-new-grounds
"IHREC’s submission has also recommended changes to the existing gender and family-status grounds.
It wants the gender ground in the equality acts to be amended to include explicit reference to, and define, gender identity, gender expression, and sex characteristics."
Interesting to see they don't mention sex just sex characteristics.
I read that as saying that they are worried that the Equality Act as it stands does reflect that the reference to gender actually means sex and they want to change it to give gender identity priority over sex (ie. women's rights). "
I think that they are worried that a legal challenge would clarify that gender was intended to mean sex and they are trying to change it before that happens