How does a premium, expensive airline like Singapore Airlines survive in Southeast Asia, the world's most competitive market for low-cost carriers (LCCs)? The answer is: it doesn't. It uses its own low-cost subsidiary, Scoot, to fight the budget battle for it.
Even though they mentioned Scoot crew have a lower pay than SIA, let's not forget that their pay is still higher than many other premium carriers such as British airways, American airlines, or even Japan Airlines and many more.