Really, ever heard of 121.5 not only that there would be a lot of other Aircraft on the same frequency that would hear and respond if required.
All Airbus crew are very very familiar with the proceedure to switch of 2 ADR's if the AOA problem occurs. They would have achieved this very quickly and regained control quickly, also the weather was ok and they climbed normally to FL380. So I can safely tell you that icing on a AOA probe WAS NOT THE CAUSE.