There is an easier way to remove the dreaded "My Bluetooth Places" from the desktop. One that doesn't require TweakUI:
1. Right-click on desktop and then go to Properties>Desktop>Customize Desktop>Clean Desktop Now.
2. Make sure that the box "My Bluetooth Places" is checked and press next.
3. Voila! You should see a folder now with the "My Bluetooth Places" inside of it. Just delete the folder.
You should update your instructions to use this over TweakUI.