The only thing specific to Steam Deck in the guide is the Discover Store. This “app store” is actually a part of KDE, which is the desktop Steam Deck uses, when one switches to desktop mode.
The Discover Store is a way to install flatpaks, which are a universal application format that runs on all linux distributions.
On Febora flatpaks should be enabled by default. You might have to enable the flathub repository, which is the main hub for finding and installing applications.