While I respect your opinion Mark IV (apologies, I forgot your first name), as you can see from the screenshot(s) of the
SPF Authorized Service Bulletin below, SPF represents the rear rotors on cars 700 to 2636 to be '89 to 92 T-Bird rotors.
Page Header;
Brake Rotor Detailed Information;
SPF Warning / Disclaimer
For reasons I can not understand, the website will say it has uploaded the disclaimer image, but in actual fact, does not, so I have attached it as a jpg file to the end of this post.
While Timemachines may, and I suspect does, do exactly as Mark IV has described it is not consistent with long standing published SPF documentation. That said, the components Mark IV is suggesting I believe, are superior to the OEM FORD rotor approach.
I suspect both components work. If you are doing the service you should explore both alternatives and select the one you feel best meets your objectives.