The exact details of memories are malleable. It may very well be that pensieves in this setting can only recover what the person remembers not what they actually experienced. It may be that this could still be useful for interrogating less disciplined minds who can remember details but not realize they do, but Dumbledore may think that if there were any specific details that were important enough Harry would in fact remember them.
The exact details of memories are malleable. It may very well be that pensieves in this setting can only recover what the person remembers not what they actually experienced. It may be that this could still be useful for interrogating less disciplined minds who can remember details but not realize they do, but Dumbledore may think that if there were any specific details that were important enough Harry would in fact remember them.