https://www.cbp.gov/travel/trusted-t...ds/us-citizens still shows some links and info - The Dutch call their "PRIVIUM" and the US/Dutch reciprocity thingy was "FLUX" which was the discontinued thing that became/is the "Registered Traveler Program NL"
Basically it's supposed to be a program where you can pay for GE to work in AMS airport and vice versa.
The old version was done away with, supposed to be replaced a year + ago with the new program. Which never happened. But, it's apparently almost ready for prime time: This link should have some good news:
https://insideflyer.nl/rtp-nl-maart-gedeeltelijk-start/
I'm on my way to AMS this Saturday from the States... I'll keep my eyes open on what it looks like, but I'm NEXUS, not GE, so I might not be able to dive in.
TDM
PS: ETA There's a thread on this over in Trusted Traveler
RTP-NL registration for non-EU passports