It's cool, I'm sure we'd accept a simple apology if Iran surrounded Air Force one with jets and forced it to land. Oh did I say simple apology? I meant missiles, lots of missiles.
Please be aware that the Austrians are weird with regard to these things. AFAIK, Austria is the only country where the activities of intelligence agencies, including foreign ones, are by law legal as long as they don't run contrary to the interests of the Austrian state.
The Austrians are very proud of the role they played as a spy-habitat during the cold war and many look back at this time with nostalgia. Anything that the Austrian president says in a context such as this might or might not be tongue-in-cheek.