Good to hear that Wayland works fine.
Kwin-x11 is unmaintained since some time ago, keep that in mind.
But for now, didnt you have any BTRFS snapshots you can boot in? Or are these just older kernel versions?
I didnt use traditional Fedora long.
Display the dnf history and try reverting back the kwin version.
I would advise using Lutris Flatpak, such a thing would never happen there.
I have a bad feeling about running Windows stuff with so much access.
You said it yourself, if it wasnt the update, some random uninstall broke things.
Also try to reinstall the NVIDIA drivers from the terminal. There is likely a DNF option to do that.