I didn't state that Ars Technica specifically mandate LLM use for their authors. What I did state about them is that their editorial standards are lacking, and they tend to produce a lot of clickbait.
I definitely interpreted his original post as suggesting that Ars also mandates LLM use, even if the words didn't say that explicitly. "even the larger news outlets" implies "in addition to the one we're already talking about"
How is it an open secret? Is there evidence for this? I still see typos in some articles so it feels like humans are in the loop, maybe that’s their AI masking?