She would have been torpedoed anyway - for the simple reason that the German U-boat commander, Kapitanleutnant Walter Shwieger on the U-20, did not know it was the Lusitania he had hit until she started to sink. (The U-boat war 1914 - 1918, Edwyn A. Gray).
“However, whether she was carrying munitions or not is a moot point.”
Not moot from historical interest in understanding british actions in the great war with regard to this topic. I wonder if they were using ALL the large passenger liners for armament shipments (Mauratania, Olympic) as well.