I actually think that it is the FSF that has been misleading people, rather than Purism. The FSF should make it clear to the public that its RYF certification allows for secondary embedded processors running proprietary firmware, and that RYF devices may store that firmware in a separate storage location from the main file system.
The FSF has made that clear. I cited that exception above. Questions on Bluetooth - #58 by Privacy2
What the FSF hasn’t made clear is what they mean by “… within which software installation is not intended after the user obtains the product”. I take it to mean that the user can not
update the firmware without going through an unusual means (e.g. buying a chip
programmer/flasher). I think the ease with which one can update the firmware on
the modem and wifi card for the Librem 5 shows that firmware updates are “intended
after the user obtains the product.”