This is a blanket statement...
and obviously NOT true based on my 1st hand experience with my race car!
Further, this statement...
infers that I am lying, which is not the case and is a personal attack.
Sorry to be the one to break it to you, but just maybe you aren't as good as you think you are being a gm "college" educated master technician and all.

Just because you haven't been able to achieve the same, you chose to turn a blind eye and turn a deaf ear!
Newsflash...when you come out of your self induced coma and open your eyes and ears, you'll find that there are countless stock and super stock racers as well as many other class racers in other venues, sucessfully running an aluminum spool in cars heavier than 2800 lbs. including yours truely without issue or concern. Further, those that build these cars are installing aluminum spools without concern or issue too!!
As to a manufacturer's disclaimer, they are what they are, written by lawyers who's job it is to protect their clients from frivolous law suits.
That said, I don't care what you believe nor do I care what you or anyone else does with their car. I am simply offering the op as well those following this thread, my first hand experience as to what has worked for me with my race cars for over 2 decades. It is not my concern that this experience proves your and Allan's blanket statements to be untrue! Meanwhile, I don't make decisions whether it be business, personal or about my race program by committee no mind based on what I read on an internet forum, so I'll just keep doing what I'm doing regardless who here finds my statements unbelievable.
BTW, I've installed and setup the R&P in the 12 bolt of my former Chevelle for many years and now do the same with the 9" in my Firebird.