The KDE packaging team is no longer packaging Xorg, but the GNOME team is. The “re-upstreaming” is a completely different effort with no guarantees on bugs. In addition, the package providing Xorg support in KDE is to be marked obsoleted and will be removed when upgrading. Here’s the actual ruling:
KDE packages which reintroduce support for X11 are allowed in the main Fedora repositories, however they may not be included by default on any release-blocking deliverable (ISO, image, etc.). The KDE SIG should provide a notice before major changes, but is not responsible for ensuring that these packages adapt.
GNOME Xorg still has full support from the team that has always worked on GNOME, unlike Plasma’s Xorg on Fedora 40.
And they did, with bsdiff, an algorithm invented awhile ago. I wish system package managers carried this/weren’t actively dropping their implementations :(