The existence of that exception, the way it is implemented, the way they work with vendors to help them fit into it, and the way they do not require
informing users of such secondary processors are all deceptive.
Just look at the Librem 5. That CPU needs a blob to even boot (to train the RAM). Normally that would just be embedded into the bootloader. But that would make it evident in the build process for their boot stack that there is a blob involved, and they can't certify that as "Respects your Freedom". So instead they worked with the manufacturer, and came up with this contrived interpretation of the "secondary processor" rule where, as long as the firmware in the "secondary processor" is at least two steps removed from the main CPU and never handled "directly" by it, it's okay. Then they had the manufacturer put the blob in a Flash ROM (Flash, so updatable, remember? just not that easily), and then they had them write a little loader code that runs on another secondary CPU. So the main CPU (running free software) boots a secondary CPU (running free software) that loads a blob from Flash and then boots a third CPU, which now runs proprietary software. According to the FSF, all this pointless obfuscation and extra levels of indirection makes the device magically compliant with their criteria. And so it got certified.
It is completely evident that absolutely none of this helps end-users' freedom in any way, shape, or form vs. just having the blob in the normal bootloader where it can be more easily inspected and analyzed (and also lets users ensure that it hasn't been tampered with). It's just adding obfuscation so users won't find the blob, and therefore will feel better believing they aren't running any blobs.
By this interpretation of the rule, I could ship an x86 PC with an Nvidia GPU that runs its proprietary driver on one of the CPU cores (isolated from the main OS), loaded by the UEFI firmware through ME or something, which communicates with the rest of the cores via VirtualGL or some other RPC, and that would make this PC eligible for RYF certification. Tell me that's not a farce.