The F section is only F, no *G/SEN stuff. Its truly tiny in comparison to the rest of the lounge. Didn't venture in there, so no clue about F preflight dining.
When its time to board, you go down a level and could board E10 and/or E11 for sure.
Re SAS: the signage after security clearly directs Lufthansa and SAS pax to the LH lounge, mostly all others to the AF lounge. Of course BA and VS point you to their own lounge.