Yeah, it's a Fedora Silverblue spin, but unofficial. I have used the ubuntu spin (now deprecated, and has a new name), and it was buggy and then didn't work because of the deprecation. Could have roolled back, but switched back to Windows for a while and Debian for my laptops. Now I only use Silverblue and have customized everything how I like it.
I tried the Bazzite-Gnome-installer for a HTPC, and it didn't work (after-setup was/is bugged). It's running stock Silverblue too now.