As a former moderator of the fora, I'd hazard the following guess.
Someone from NJS contacted the esteemed Woomera(s) and pointed out that the communication reproduced on the thread was Commercial in Confidence until Qantas had made the appropriate changes and announcements and requested that as such, the thread be removed/suspended.
Whilst PPRuNe is a rumour network, I believe that the posting of the message only disadvantages NJS employees, as most likely management will be reluctant to inform their staff, knowing that some can't be trusted to respect the caveat that comes with the information.