@cranky-dan - I think he didn't mention to do a nandroid backup for one of the following two reasons:
1. He just forgot to mention it because it's always a good idea!
2. He might have thought because this method is 100% reversible and easy to start if you got into a hiccup spot (making it virtually impossible to brick your phone as long as it's charged) that there was no need to do the long process of a nandroid backup.
If you want to know how to remove the root, feel free to mention it! I got the code to test mine from the OP