you asked why people said they were attached.
Yes because they clearly aren't.
Is there any practical (by this I mean not imaginary) link between same sex marriage and the GRA?
That was not what you asked and you have reached your own conclusion
If the GRA is a consitutional law a human female is not always a woman (a legal class) and men with GRCs are not women nor mothers (a sub-class of women)
A ) man goes to court (his newly birthed baby on hip) and says I want the govenment to be forced to pay me compensation for not providing me with my right an abortion the Judge will first ask for the section of the 2018 act which gave him the right to an abortion.
And? I think you're implying the judge would rule against the person taking the case but that's a pretty out there assumption.
Below is the legal framework for abortion provision in Ireland
The constitutional change was Sep 2018 and legislation was passed in Dec 2018.
Can you post up which bits which give a man a right to terminate a pregnancy?
FUNDAMENTAL RIGHTS
PERSONAL RIGHTS
ARTICLE 40
1 All citizens shall, as human persons, be held equal before the law.
This shall not be held to mean that the State shall not in its enactments have due regard to differences of capacity, physical and moral, and of social function.
2 1° Titles of nobility shall not be conferred by the State.
2° No title of nobility or of honour may be accepted by any citizen except with the prior approval of the Government.
3 1° The State guarantees in its laws to respect, and, as far as practicable, by its laws to defend and vindicate the personal rights of the citizen.
2° The State shall, in particular, by its laws protect as best it may from unjust attack and, in the case of injustice done, vindicate the life, person, good name, and property rights of every citizen.
3° Provision may be made by law for the regulation of termination of pregnancy.
Health (Regulation of Termination of Pregnancy) Act 2018:
https://www.irishstatutebook.ie/eli/2018/act/31/section/2/enacted/en/html#sec2