The exact same wording is in the *A reference guide, which I told the supervisor to read out loud. She did so and immediately said that while these are the written rules in LAX they'd only allow in people that are in F on the departing flight.
Yep. Did you really think that SQ was willing to pay a F lounge usage share for cheapo pax (upgraded or on awards) who arrived in scum carriers like UA F or LH F, but depart (due to a lack ot awards or upgrades) in SQ C - or maybe even SQ Y?
Not gonna happen. So the F section of the lounge is open to those who DEPART in F, and the DEPARTING airlines at TBIT pay the respective share for each pax using the C or F section.