Video
At 3:54 of the video, compare the four official "cues" of Stall with the reported attitude and aspect of AF 447 at the time of AutoPilot OFF...and review the pilot's actions. Nose up, not immediately responsive, uncommanded Roll, Stall Warn active, and from the DFDR, (inertial record) buffeting.
Question. In Overspeed, with Autopilot active, is Stall possible?