authored by someone who clearly understands the ecu
Also inaccurate. He attempted to translate a very very tiny portion of the FR into English, no more, no less.
The FR itself was authored by someone (or someones) who clearly understand Motronic.
Just read the FR for anything you can't find in the s4wiki. There really isn't any other alternative; literally nobody else on the planet has bothered to do any other work. They (like you) have glass beads to trade. They're generally completely uninterested in doing anything cooperative. They have money to make and mouths to feed. If you are looking for a more cooperative (technical) culture, look elsewhere; this is quite literally one of the last places you'll find it.