[general_pizza]

The method they're describing is only permanent for devices without a removable startup disk, right? If they run this on my raspberry pi, for example, just reformatting the sd card and following the same process as when I first got it should immediately fix this.

[cakeface]

Yes, it makes every effort to corrupt the filesystem that the operating system is stored on and mess up the networking before shutting down the device or rebooting. If the device has its' OS on readonly media then this won't do much. Maybe it will turn off until someone cycles it. If you can reformat or reflash the disk then you can recover. For a raspberry pi that's cool. For an IP camera it's generally a problem.