This is the wrong thread to kick up a fuss about this. If these guys are using "OS" the same way that Ubuntu and Debian do, that's just fine for a new project. It also means that your complaint has nothing to do with this new project in particular and is thus off topic. This matters because threads about new projects are the heart of HN and deserve special care.
They aren't using it "the same way Debian and Ubuntu do." Debian is named Debian not "Debian OS." Ubuntu is named Ubuntu not "Ubuntu OS." The releases have own names.
Elementary "OS" guys use it like OSX and iOS which both conform to the real view: Note "OSX Lion" or just Lion and definitely not "Lion OS."
I suppose that you had better go down and sort out those blatant liars CentOS, ClearOS, OS/4 OpenLinux, SolusOS, PureOS, Chrome OS, Joli OS, Peppermint OS, ZevenOS and PCLinuxOS.
How dare they try to advertise themselves as operating systems.
This is the wrong thread to kick up a fuss about this. If these guys are using "OS" the same way that Ubuntu and Debian do, that's just fine for a new project. It also means that your complaint has nothing to do with this new project in particular and is thus off topic. This matters because threads about new projects are the heart of HN and deserve special care.