Here is the DMV mentioned:

/*can identify all Enterprise-edition-specific features that are enabled within a user database by

using the sys.dm_db_persisted_sku_features Dynamic Management View */

--SQL Server 2008 only

USE <DBNAME>

GO

SELECT * FROM sys.dm_db_persisted_sku_features

I have this as 2008 only. I assume it will also work for 2008 R2. Maybe it was talking about the previous versions (2005 and before).