!WARNING! TL;DR using the iFixIt camera and this guide will result in a never-ending warning on your lock screen and system messages about it not being a genuine Apple camera.
The guide is great. Apple’s right to repair tenticals aren’t. I had the joy of having a friend ship the part from the US to Europe, since the parts weren’t available from iFixIt Europe — parts + shipping, +shipping to europe +import fees (Another $100+ on top of the cost). Turning the phone on for the first time revealed a pop-up about a non-Genuine camera. Then I proceeded to find a badge on settings which is permanently warning me that the camera isn’t genuine. The worst part, a push-style notification constantly on the lock screen notifying me of a non-genuine Apple camera. Needless to say, I’m incredibly unhappy.