In any case, the only "real" F lounge is the Wing, but that is only opened to pax originating in HK, not transit pax from EU.
There is a cordonned section in the Pier for F and OW Emerald.
You could try to get admitted to that section based on your previous F boarding pass. The outcome is uncertain and I doubt that many could share that specific experience as CX is only restarting F from CDG in mid-January and has just restarted F from LHR.