The malt referred to is from Greencore (as also used by Guinness.-Some of us did a grain group buy from them last year). This is base malt, I imagine the PH get their specialty malts elsewhere.
You could make that point if that's how you define an Irish beer. However many breweries all over the world import ingredients such as malt, hops and yeast to gain a certain flavour profile, so this approach is not unique to Irish breweries. If you were to limit yourself to available Irish malt, hops and yeast there wouldn't be much variety in the resulting beer.
