New dat point for Friday 30th September:
When I arrived at the NS station (6:20 PM) and went upstairs at Departures 1-2 there was a very long line for regular (non prio) pax coming from outside. There was no line at the Priority entrance behind the KLM SkyPriority check-in. I visited the Privium ClubLounge before heading to the security checkpoint behind check-in row 3, around 7:30 PM. As mentioned before, this only works when you have Privium or when your flight is already boarding. There was one kind lady checking eligibility, just show your Privium card. Security was a breeze, as there are no more than 5-ish pax in front of you. Still, very long zig-zagging lines for regular non-priority pax upstairs. (Downstairs it seemed manageable).
Right now I’m in the KLM Canteen 25…it is filled to the brim.