Have an Android phone? Technically yes. It runs the Linux kernel but not GNU (probably, unless you've installed a layer with gnu).
Have a Chrome OS device? It runs GNU/Linux and most have a user layer that can run Debian.
Have a Windows device? wsl exists and is quite nice. Lots of developers use it.
Is Windows Linux too now?
I don't think this is principled really beyond the fact that Google chose to use different branding whereas FOSS distro vendors actually called what they distributed "Linux." Sort of how Hyenas are phylogenetically feliform but most people consider them dogs.
Do you have some reference for this? I just did a quick survey of the people in the horse barn I'm typing this from and none of them consider hyenas to be dogs. I imagine some people do consider them to be dogs since in some cases they can have a passing resemblance, but I'm dubious that most people consider them dogs.
Mind you I'm not in a horse barn.
Now, I think most people mean "Is that running something that markets itself as Linux, at it's core?"
Even that disambiguation isn't great, though.