Echo-ing ermen- just not worth the bother, it seems..(and supports my original hypothesis, CX moved, partly to save on what it was paying QF!)

https://www.flyertalk.com/forum/29889157-post300.html

https://www.flyertalk.com/forum/30027575-post316.html

im fairly certain that the schlep isn’t worth the bother. The QF lounges are at what is the ‘furthest’ part of SIN T1-3, from where the T4 shuttle come/goes (Closeby the C gates:T1 vs the high F gates T2)