The American Express Hilton Aspire card offers a $200 semi annual resort credit. It seems what is defined as a resort has been tightened and only properties appearing on this list will trigger the credit. Some properties that appear on the official resort page will not trigger the credit.
Previously the American Express Aspire landing page linked to the official resort page, but it now links to the more restricted Aspire resort page. There are ~260 properties on the Aspire page and 300+ on the official resort page. There is also at least one datapoint of a property appearing on the official resort page and not on the Aspire resort page not triggering the credit.
Hat tip to garettg
Source: doctorofcredit.com