I think most of you are completelty missing the point which is without the original post starting the removed thread, there would be no IAA investigation.
Until these matters are brought out into the open, there is no possibility of an investigation. Pprune performs this function flawlessy. Don't believe me? Try making an allegation to any regulator of anything and see how far you get!
You will be fobbed off by a combination of "where's your evidence?", "this is an unfounded allegation", "You are not competent to make such an allegation". Furthermore, if your allegation has some truth in it, and you can be identified by the likes of a Ryanair, there is every chance of getting sued.
One final point. If there is found to be any truth in the allegations (which I am not competent to comment on anyway), it won't leave a mark on Ryanair because no matter what the company culture, it is the Pilot's decision and Ryanair will simply hang those concerned out to dry. This is the nature of the insidious "double bind" problem that can affect people's judgement.