That's not entirely correct I'm afraid. One of the conditions for arriving as a VTL passenger is that you must be travelling on a designated VTL flight (and with SQ ex-SYD, only two of the three flights are actually designated VTL flights; SQ242 is not and if arriving into SIN on that flight, you will end up needing to isolate for 7 days).I am afraid Australia and Singapore adopt different perception about VTL. in Australia context, all flights are ONLY FOR VACCINATED TRAVELLER as announced by Qantas CEO and PM Morrison. All passengers on board are fully vaccinated with approved vaccines. so all flights are VTL by default.
SIA marks VTL and non VTL. It seems to me SIA is still carrying travelers who has not had vaccines on NON VTL ? We have yet to understand from SIA if all SIA flights are ONLY FOR FULLY Vaccinated passengers. We need clarity from SIA
None of the QF flights to SIN at the moment are designated VTL flights and they don't even appear as an airline of choice on ICA's SafeTravel website.