Oh, wow, Kotaku was extremely offensive here. They assumed that a Japanese/Asian developer didn't know about certain companies based on some random tweets, apparently (?) -- then proceed to discuss it like it's typical Japanese/Asian. Seems somewhat racist, even.
And yes, while the entire thing seems misinformed, writing "Clueless about Valve", etc. is unnecessarily rude -- they could have written, "Didn't know about Valve" or something like that, which would have been slightly less rude, and made just as much sense. Using the word "Clueless" instead of "Didn't know" makes it seem like they dislike the person they were writing about.