Why yes debian?

The reason is simple: we want to get you security updates faster, and give you more control over your own machine.

Security work has sped up across the entire Linux world; vulnerabilities are found faster than ever, in packages and in the kernel itself. A Fedora base lets patches reach you more quickly, and on your own terms.

It has been Slackware based since inseption I think just because that’s what fit when it was created.Fedora particually Silverblue and in turn some of the Ublue projects have shown you can create a super stable environment for container based workloads.

Updates are seemless and targetable a fedora backend gives them an easier switch to podman should docker not be viable in the future.

From the article it looks like they’re focusing on Faster security updates Better hardware support through the Linux kernel There’s a clear seperation of the base os and the apps,plugins etc that Silverblue/Ublue can offer that Debian couldn’t do as easily and they’d be better off just sticking on Slackware.