From the article that started this thread
'I've got a problem I don't have vertical speed.
I haven't seen anyone address this comment yet. They knew they had lost air speed indication, but from this comment I think they believed that they had a static system problem. This could lead them to discount the altimeter showing the climb and loss of height in the stall. Whilst I've learnt from the AF447 threads that the vertical speed indication is inertial based, is this something that they would know / remember under duress?