The instructions are incomplete. also do
sudo dnf install https://mirrors.rpmfusion.org/free/fedora/rpmfusion-free-release-$(rpm -E %fedora).noarch.rpm
sudo dnf install libavcodec-freeworld
(as per How do I enable h265 HEVC playback in Fedora 43 or 44? (2026))
Maybe someone can update the doc. I have zero clue how to do that.