A very sad read, I feel for the crew. This underscores what I have been taught in de sim after the AF accident: you have to compare ALL indications when faced with unusual attitudes, never instinctively react to just one parameter.
If your PFD shows a ridiculously large nose up pitch angle then your airspeed should decrease. It is impossible for the speed to remain stable with such a pitch angle. If it does, something does not add up...