That is what I have been told as well. However, the info on the Atlantic Bridge website is a bit less clear as they state "All graduates of Irish medical schools who hold EU Passports and who applied to medical school in Ireland through the
CAO (Central Applications Office) are guaranteed an internship post in Ireland. Graduates who hold EU Passports, but did not apply through the CAO, are ranked below those who hold CAO numbers, regardless of their centile ranking in their graduating class. ".
They do not say anywhere that EU passport holders who applied via AB are guaranteed anything.
Ireland is a relatively small country so I am not really sure whether they really can guarantee an internship for each and every Irish and EU citizen.