Etudiant, I think you read the Alter site correctly. It is asking for a ID number and password.
Even with the AF447 "test flight" paving the way, I would be surprised that anyone would take the risk of a test flight to study deep stall behavior of the A330. I did personally theorize that AF447 must have created a lot of valuable pitching moment data on its way down.
I do not claim to be an aerodynamic expert or a test pilot, however the low slung engines found on most modern transport aircraft would create an adverse pitching moment that would make stall recovery difficult, so pulling engines to idle to recover is not an unexpected maneuver. Once the stall is broken, then power could be advanced.
If they have actually performed a deep stall test, then I would expect information regarding the results to appear in the BEA final report.