If you read further you'd see that he didn't say you shouldn't be able to put anything you want on the desktop. Just not shortcuts. He explains how you could put any file on the desktop by setting the "desktop" label in the files DBFS entry and thereby making it show up on the desktop.
It's just that it's not a shortcut, since there is no need for shortcuts in a database file system, it's the actual file.
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If you read further you'd see that he didn't say you shouldn't be able to put anything you want on the desktop. Just not shortcuts. He explains how you could put any file on the desktop by setting the "desktop" label in the files DBFS entry and thereby making it show up on the desktop. It's just that it's not a shortcut, since there is no need for shortcuts in a database file system, it's the actual file.