What utter fucking bollocks, to use a technical constitutional term.
There is no doubt that the 1976 Order had the same meanings as the 1975 Act in GB. No doubt at all.
There is no doubt that the 1998 Act was written with the same understanding of those words.
The Windsor Framework provision about “no diminution of rights” referred to rights that existed pre-Brexit, and the 1976 Order was then (& still is) the relevant law on sex discrimination.
It is true that what are often referred to as “the unique circumstances of Northern Ireland” require careful consideration in relation to politics, religion, geography, history etc. But not biological reality.
I am beyond cross to read that.