A quick summary of this [frankly, rather crappy] article boils down to “I don’t understand, why people ignore the 4% of ChromeOS usage when talking about the 3% of Linux usage?” written in the most facepalm-worthy way, spamming fallacies like there was no tomorrow:
“Which is also Linux, but the wrong kind of Linux.” - strawman
"which means that [desktop Linux]¹ has less than half of the [desktop Linux]² market." - ambiguity (“1” refers to a subset of “2”)
“It’s not a typical Linux, because typical Linuxes are tools for nerdy hacker types, and that kind of OS will never, ever go mainstream unless someone forces people to use it” - begging the question + ad hominem
"So naturally the Forces of FOSS hate it. Of course they do. And how do they express that contempt? By saying it’s not a True Linux." - repeating the strawman again, for an ad nauseam
Also note that the same type of stupid reasoning from the article would also “prove” that MacOS is a *BSD.