The first letter has to do with alpha. Alpha is a type of radiation, is used in statistics to denote significance level when proving null and alternative hypotheses and is also a leadership rule. It makes no sense to say that radiation is gone (at least not to me) and I doubt you'd go deep into statistic calculations so it may have to do with the third one. So I'm assuming some form of leadership has been destroyed.
He's quite good with these code breaking things.
I know he is....should make them more challenging!
Alpha is gone. Something along those lines. Olaf should really be a code breaker if that's the case.