Even in the hypothetical that datacenters would double Ireland’s GDP what real positive impact would it have if they pay zero taxes?
The rest of Europe sued Ireland to get them to stop being a tax haven. Ireland basically refuses to do so. If they did, most of their economy evaporates overnight (and the US government gets a lot more tax revenue). Ireland's economy is basically 2 tax shelters in a trench coat.
They do pay tax, 12.5%. Plus employment during construction and maintenance. There's also ancillary investment in national infrastructure such as Google's CO2 battery