Both first officers of SQ006 had their ATPL, correct (by luck). Other first officers of other SQ B747-400 flights did not.
The word 'crew configuration' (in the beautiful color) in your post is exactly what the CAAS notice to SIA was all about, and SQ006 had that very crew configuration.
You are having trouble putting 2 and 2 together (are you a pilot?). If this was a court of law (not a court in Singapore), this memo would be a very important exhibit.
Mind you sir, it is now a part of PPRuNe archives. There is going to be litigation up the yeng yang over SQ006. Sharp lawyers read carefully, including PPRuNe.
Have a nice day.