Working for me. I have to admit the guide is a bit of a clusterfart. It was extremely confusing to follow, and the whole time I was scared I was going to mess something up because of all the notes that were placed throughout the guide.
Here's what I did using Clover configurator. Make sure to mount your EFI, and import your config.plist
1. I generated a UUID by typing "uuidgen" in terminal. I typed this a few times to make sure I got a unique code.
2. I pasted the generated UUID from terminal into "SmUIDD" under the "SMBIOS" section in Configurator.
3. Under the "Rt Variables" tab, I pasted my network's MAC address without the colons (found by going into System preferences - Network - Ethernet - Advanced - Hardware) into "ROM" at the top drop down menu, and my Hacks serial number (followed by a combination of 5 random numbers and letters, example: 5E8F2) into the "MLB" field that's to the right of "ROM".
4. I pressed "calculate", exported the config.plist, and restarted the computer.
5. Ran imessage debug and took a screenshot of the values.
6. Restarted again, and ran imessage debug again to make sure all the values were identical to the screenshot I took. Logged in as soon as I confirmed there were no changes.