"The Nazi collaborator was advised by de Valera to continue using an alias so that if the French government asked if he was in Ireland"
Late in his life DeGaulle visited Ireland. I think DeValera was still President (though extremely old). In his tour of Ireland, DeGaulle expressed his support for a "united Ireland." (Anything to stick it to the English, of course).
I wonder if de Gaulle would have been happy to know about De Valera harboring the Nazi?
Good point!