I wouldn't trust the enrollment info listed on any card's AMEX Benefits pages. If you signed up for Sax 10 years ago, you are still enrolled regardless of what the site says.
I'm signed up with Premium Car Rental and it never records on my platinum card after the rental. I've called and it still doesn't work. So, not sure what's wrong with their system, it just doesn't work even though it says I'm enrolled. Shoprunner is a new one that automatically canceled and can't be fixed unless I call CS, which I won't because I'm tired of dealing with these issues.