Well firstly, all I can say is that the industry world wide is very small. The letter was leaked out and many people have a copy and it is currently in circulation and common knowledge.
Secondly, airasia staff have been disgruntled for sometime and most of them do voice out their opinions especially when it comes to dandie and his mating rituals ( I say good luck to him ) So the problems faced by staff at airasia is also common knowledge, and when you hear the same story over and over again from different sources then this lends credence to the story.
Lastly, chinny chin chin, razamatazz, oh mah ect ect have been asses to many in the industry in the past. Their airfartness has always prevailed and they have tried to keep the squadron retirement scheme alive and well. Unfortunatly there were too many squadrons involved and they started killing each other because they all wanted the power and titles.