Most of the revenue from global companies like Apple registers in Ireland, and counts in Ireland's GDP even though it's not really in Ireland and it's not doing anything for Ireland.
Like the OP, you are badly misinformed. Ten seconds of Googling provided me with the following information from a newspaper article: "[Apple] paid $17.1 billion (€14.6 billion) tax in Ireland [in 2025], which represented 39% of its $43.2 billion of tax payments in the year".
So we can see that (a) Apple does not book "most" of its global revenue through its Irish operation, and that (b) even so, Ireland benefits hugely from having Apple's European HQ located there.
