The official conclusion was that the murderer did probably spot the Palmes as they entered the cinema, giving him time to go and borrow a revolver and get back

The official conclusion was that the murderer did probably spot the Palmes as they entered the cinema, giving him time to go and borrow a revolver and get back in time to kill him once the movie was over. I don’t know any definition of stalking that would include that sequence of events. But the topic was data privacy - I strongly doubt that the facts that Palme’s person number and address were public contributed to his death.