Got the following response from IE earlier:
I have checked the website the pricing is correct Cork to Heuston €10.00, Tralee to Heuston €20.00.
So this means that there'll no longer be any €10 fares from Tralee to Dublin but there remains no less than three trains a day from Cork priced at €10 (including the train the 19:15 feeds into - and that train is €10 from Limerick also).
And there remains €10 fares from Sligo, Westport, Galway, Limerick and Waterford to Dublin too. So have IE decided to specifically s**t on their Kerry customers?!?!?!