Have you seen those tailstands before Orac? They are massive, equipped with wheels and a hydraulic jack. They are also taller than the wing height (presuming they were 747 tailstands.) As he was manouvering in a confined area that he mistakenly entered, I would have thought one of them would be monitoring the wingtip clearance. You can see your wingtip from the cockpit side window.
I wonder if anything would have been said in Singapore if TPE hadn't informed the flight of the event?