An Irish person is also more likely to mean it when they say they have always wanted to fly for aer lingus because it is their national carrier. Having someone from germany saying they have always wanted to fly for aer lingus and they've never even lived in dublin but suddenly want to move their life to ireland is questionable ! .
I do think that nobody means it...all the Irish guys who won't pass the selection are likely to say the very same words to anybody else.
Honestly, I wouldn't ever say stuff like that, even if I had the chance to apply to my flag carrier. Just my opinion, though