That’s not mentioned in this specific blog post, but that’s always been one of Vanilla OS’s defining features, it’s “apx” package manager to install those various types of packages

It’s even using Distrobox actually, but the point is to make it simpler to install packages for those contrainers, with the user not worrying as much about managing the individual containers, and not having to memorize the specific commands for each individual distro’s package manager

Basically, like the rest of Vanilla OS, the point isn’t that you can’t do this stuff elsewhere, it’s that it’s trying to make it easier to do it