No its a toolbox (not the program) based on Fedora, with minor changes and improvements.

This is a great way to package stuff, as it means changes are done fully automated and scalable.

Ublue has maaany images, for more Desktops than Fedora officially supports (so they wont be as stable but they are there), including different kmods and rules for Asus, Framework, Surface, with or without NVIDIA drivers.

There are other projects using ublues tooling, like Secureblue, which is now in a well working state.

So its not only good for Nvidia but the shitty mess that is kernel modules and proprietary drivers, while being on a recent distro, can be tamed best in ostree and immutable snapshots.

If an update fails, you wont get it. And even if, you will have a rollback image that you can select on boot.