Uhhh.. From that article, it first requires the user crack and compromise their system software through kernel exploits (also known as jailbreaking).
If you do not password protect your system or
purposely crack the software, I don't think you really care that much about securing your device in the first place.
To elaborate:
The iPhone is already using an
encrypted file system. The file is protected. In the example used on the web site, someone has compromised the OS through kernel exploits (that have been patched since iOS 7.1). They have loaded a compromised version of the OS, which enabled access to the encrypted file system - and they are surprised they can get to their files?
It's like kicking in someone's front door and saying how easy it is to get to their belongings. They're just lying around in someone's room where anyone can take them! Uh, yeah, you just broke in.
Update your device to iOS 7.1.1 and then try to access these same files.
Don't want your security compromised? Don't compromise your device!