Interestingly, pre-COVID the “club” privileges used to be granted to all Spire members. I’m wondering if now Diamonds without the annual lounge pass are now only granted breakfast (if they choose that as their welcome amenity).
They never really had a club. They have generally had a special menu on Club 29, or whatever it is they call the top floor bar. There is a special menu and you can choose a few appetizers. You also get some complimentary drinks.
Personally, I like that alot. It's not so sterile and stuffy as most IC lounges. Beautiful views. Waitstaff is generally friendly. One night I went with four guests and they comp'ed food and drinks for everyone during the Diamond Happy Hour.
I was just there in April; very satisfied.