Is Chrome a Linux Desktop?
It's has a desktop and a Linux kernel so in one very limited sense yes. It is also open source in the sense that you can get access to the code. But, It is only interested in a very limited set of hardware and does not appear to be interested in community collaboration.
This doesn't fit my version of Linux but I am of the FOSS philosophy as I suspect are the presenters. My daughter uses an Ubuntu laptop but couldn't care less about any of that she has a laptop with a Web browser, office suite and graphics software. She wouldn't care if this was a MAC, Windows, Linux, Chrome or anything else as long as it does the job. Most users use Windows because that's on the PC when they buy it, not out of any Microsoft loyalty.
And to be fair why should we expect anything else?