Bit more nuanced than that: http://i.imgur.com/WFjgGDr.jpg
What's been busted, is asset sharing, not levels per-se. The data from .mis files gets authoritatively sent from the server. That shot was from killing off all files in a secondary copy of development except for the forest file, and connecting to a hosting normal development. For unique asset sharing, that will need the PR Dan noted, or something like it.