If you want to familiarize yourself with the case details, the case number is 138717.
The document that you quoted is not what the user gets on your website.
Going to mamiyaleaf website, then products, then leaf credo, the data sheet, you find this document: http://www.mamiyaleaf.com/assets/files/credo_DS_EN_A4_RGB_1.12_WEB.pdf
which declared Phase One 645AF is supported and mentions no restrictions.
So far you are sticking to the company line that the company did no wrong, so no surprises yet.
I wrote both documents and therefore am responsible for any errors or mistakes. When I make mistakes I tend to correct them and apologise when appropriate. I don't know any other way of working with customers.
The PDF I have quoted sits on our firmware download page
and is available for users/ public:
The Brochure you are quoting from is a marketing piece and not a technical document. It is the same PDF that get printed and as such it only gets updated when there are real updates or changes (or errors) to be made. There is a long list of supported cameras on it and this is not the type of document where we can specify in detail the different configurations and specific limitations. Apparently your AF body has got a very old firmware version on it. The vast majority of bodies out there have already been updated at some point.
Any limitations, special instructions or notes are normally found in the Release Notes, User Manuals on in Knowledge Base articles on Phase One's website, such as this one
Saying that, I'm working with support and with your local dealer to find the best and fastest solution for your situation. Updating firmware on older bodies is not as easy as on the DF and DF+ and it takes time and tools to be done. The camera then goes through a service check, clean etc. etc.
If you are considering the DF+ then you will gain a few small improvements over the DF when using the Credo on it, such as opening/ closing of the shutter when you go in/ out of Live View.