So here is the lounge access policy, specifically referencing W=A hotels. On what basis can they exclude Diamonds from the lounge at the W=A New York or Arizona Biltmore?
** Executive Lounge Access Policy
The following policy will apply at all Waldorf AstoriaŽ Hotels & Resorts, ConradŽ Hotels & Resorts, Hilton Hotels & Resorts, and DoubleTree by Hilton™ hotels with Executive Floor Lounges. Executive Floor Lounges are available only at select properties.
If you are a Gold HHonors guest, you and up to one additional registered guest will be granted complimentary access to the Executive Floor Lounge only if you receive a room upgrade to the Executive Floor or an upgrade to a room type that confers Executive Floor Lounge access benefits.
If you are a Diamond HHonors guest, you and up to one additional registered guest will always enjoy complimentary access to the Executive Floor Lounge, even if you do not receive a room upgrade to the Executive Floor.