I'm aware of those facts, but as I stated in my post, before the GFA, people born in the 6 counties were automatically considered Irish citziens by the Irish state, but not by the UK. As such, proving you were born in NI would not at the time have proven to FIFA that you had the appropriate nationality to play for ROI. You would have needed some other document to prove you had the appropriate nationality, and in practice, that document is normally an Irish passport. I agree that anyone born in the North was always entitled to an Irish passport though (well by "always", I mean since independence for the 26).
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