As you're presumably aware of, Mendix added a new data source recently. However, and somewhat confusingly, database is the new data source, not the newly minted xpath. Xpath is actually pretty much what database used to be; database is a new, simplified data source. So technically export to csv wasn't removed from database; database was renamed to xpath.
Weird, I know, but after many hours of discussion on what to name these sources, this ended up being the clearest naming scheme, especially for new users.