There are maintenance requirements to test what is called “aft steering”, located in the machinery room for the rudders. I was on aircraft carriers, but I would think the testing requiremnts to ensure the aft steering control function properly would be similar on a destroyer.
The ship has variable pitch props, two shafts, and turbines. It ought to have a reasonable amount of maneuverability without any rudder input.
Not only that but if they were at sea & anchor detail for their approach to Singapore then aft steering would have been manned as well.