While it is good info I am not sure it is essential info that every would be hacker of the 360 wants to know. "Microsoft blows fuses in the CPU which we can not easily change* and that changes what hacks you can use, don't upgrade or run games beyond the time your dash was released until you know where you are at with regards to it all" is pretty much what you need to know, everything else is fluff and curiosities which I am fine with people learning but again not sure it is essential.
*some with university grade gear and many hours on it have managed to do something I believe (decap, find it and then play with an atom force microscope** or similar, all before recapping and resoldering the BGA and hoping you don't go over thermal cycle limits), that and also read the CPU key from the BGA balls (it is hard but you can probe them) which helps with some things. Can't find the link to the paper right now though. If it was just necessary for one 360 to reveal some aspects that were hidden that is one thing (see also hacking the original xbox by bunnie
https://www.nostarch.com/xboxfree ) that would be one thing, however for a production or even vanity run it is probably still not worth it.
**it seems all the cool tools are coming down in price to where mortals may be able to do something about it.
http://www.afmworkshop.com/atomic-force-microscope-prices.html reckons "From $26,450 to $55,795" for one.
I should also say there are things called resettable efuses which can be used in cases of overload, to isolate segments or as a hard halt to call for a reset/diagnostic/security team. You tend to find them in high end servers, though given it was IBM that holds many of the patents (which in turn made the powerpc chip that runs the 360) that is not all that surprising.