[rando832]

> It's also unclear to me what the distinction is between this part of the criteria and the RYF certification.

Ya, you are confused.

The PureOS endorsement is about a distro you can download and put on a computer (the distro doesn't include a bios or related firmware).

RYF is about all the software that comes on a computer/device, and the website you use to buy it, it's much more expansive.

So, Purism's computers are not RYF certified, but they come with a distro that is fully free (the disto does not include some nonfree firmware that comes on Purism's computers).