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OS X is also missing, isn't OS X a relevant platform?

Of course both are relevant, they just went for the most popular platforms first, plus FF OS, which probably was a kind of low handing fruit due to its HTML5 apps.

the chrome app will run both on linux and mac os. and windows. and the chromebook. same does the web app. one of the marvels of the modern web :)

This is why it matters that we say GNU/Linux, not just "Linux". Android and Chromebook run the Linux kernel. As well as Firefox OS AFAIK.

I'm especially sad to see "desktop" used as a synonym for "Windows".

It's not "Chromebook" it's Chrome App (aka extension). So it runs in any (non-mobile) Chrome browser.