I believe you are referring to the Error 53 bug which has since been fixed. Initially, it was caused by people attempting to update their iPhones with a Home Button other than the original factory-installed unit—the update would pause halfway through and the iPhone would be bricked.
This guide involves transferring your original Home Button to the new display, so that's not an issue in this situation, but if you were to use a new Home Button, you would still be safe since Apple's issued a fix for Error 53.