I understand why they wouldn’t want to suddenly change the branding of existing projects though.
I’m not sure if I agree, I feel like the long term damage of keeping the names is greater than changing them now to Fedora Plasma Atomic (Formerly Kinoite) / Fedora Atomic Workstation (Formerly Silverblue). Leaving them as is, is just going to create more confusion in the future to new users who won’t immediately understand why the naming convention is different for the other spins and will create more confusion for documentation / support threads online.
The foundation supports a bunch of other open source projects, after all there is a lot more to devices that run the Linux kernel then just the kernel.
Also, I found it a but funny that the foundation created the PDF using Adobe InDesign 19.4 (Windows), according to the metadata in file posted on their website. (original | archive of the PDF)