That's not the Irish flag
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https://en.wikipedia.org/wiki/Saint_Patrick%27s_Saltire
It has a long history in Ireland.
It represents Ireland nonetheless (well, now it represents Northern Ireland, but still).
As does the Confederate Flag for the US...does not make it a recognised flag of Ireland.
To quote the first paragraph of your link
"Most Irish nationalists and others reject its use to represent Ireland as a "British invention"[2] "for a people who had never used it".
We had our own flag previous to this and after it, before we settled on what we have today.
Rule of thumb, the Irish decide what represents the Irish not the UK establishment.