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Now more than ever, ChromeOS is Linux with Google’s desktop environment
(www.aboutchromebooks.com)
From Wikipedia, the free encyclopedia
Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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Originally, ChromeOS was the Chrome browser with just enough code to boot to and take care of other essential OS functions. Like, the system settings and browser settings were practically merged.
The author is alluding to more recent efforts to untangle and separate ChromeOS from the Chrome browser. I believe the goal is for the Chrome browser on ChromeOS to be essentially the same as other Linux browser builds.
So these days ChromeOS is structured more like other Linux distros, with a huge difference being how locked down it is.