SteamOS seems to not be counted at all in the first page. Apparently, it’s not just “All OSs combined” vs “Linux only” but there are additional filters applied. Perhaps the first page is desktop-only. The article either also cares about desktop gaming specifically or is uncritically parroting the survey page. I think both Valve and the article writer should be clearer about what they’re talking about.
SteamOS seems to not be counted at all in the first page. Apparently, it’s not just “All OSs combined” vs “Linux only” but there are additional filters applied. Perhaps the first page is desktop-only. The article either also cares about desktop gaming specifically or is uncritically parroting the survey page. I think both Valve and the article writer should be clearer about what they’re talking about.