Not to steal the spotlights away from the BA-situation...

​​​​aussiedisneyfan according to https://www.singaporeair.com/en_UK/u...unges/partner/

Singapore Airlines offeres as Aspire T3 lounge substitution the option:
as you mention "Café Frames"
AND the Privium Lounge (west) for their most premium FFP-members "PPS-Club"
(so no passengers holding other airlines Star Alliance Gold status or just plain Singapore Airlines Business Class passengers)

The friendly folks in the KLM Forum under thread Mess in AMS today - April 2022 onwards
Might be able to shed more light/insights on the actual situation: i remember it had been discussed there too

EDIT: if SQ mentions " café Frames", i bet it will be that option only, as to lower trample damage & influx to "café flor"
They need to divide the crowds otherwise to manage to flow...