That page says that there is a desktop called "KDE Plasma
Desktop". The
Fedora announcement is about something called "Fedora Plasma Workspaces"
which is about "leveraging the KDE Plasma Workspaces technologies."
As often happens, it would appear that the announcers know what they're
talking about and hence assume it's clear to everyone else, but it
isn't.
Read Wikipedia if you want to know details about facts from 5 years ago.