According to that website under the section Course Fees:
"If you are planning to progress to full-time further education or undergraduate higher education in Ireland for the first time and you meet certain nationality and residency requirements, you should be eligible to have course fees paid on your behalf by the State.If you then progress to post-graduate education, it is possible through the means-tested maintenance grant schemes to have all or part of your tuition fees paid for by your local grant-administering body. It is thus possible, depending on your means, to enrol in a PLC course and graduate some time later with a Doctorate degree without you being required to pay tuition fees."