Robot Operating System (ROS) is also an operating system, but it runs on top of computer operating systems like Linux and MacOS, and is focused on supplying the

Robot Operating System (ROS) is also an operating system, but it runs on top of computer operating systems like Linux and MacOS, and is focused on supplying the services, build toolchain, and communication standards/paradigms that are useful for implementing a robotics system, much as Linux (and its distros) are focused on providing that for a general computing environment. In any case, it's clear that the project under discussion here isn't really any of these things is rather a system shell/GUI/launcher. But calling it an "OS" falls under the fun tradition many of us enjoyed in our youth of trying to recreate our own Windows in whatever was our programming platform of choice, and thinking that was what an OS was.