At this point, any site that is posting multiple articles within a day is pretty safe to assume it is LLM content. The sites with actual journalists will have a much lower post count per day. There's no way a site staffed by intern level people writing that much content had time to investigate and write with editorial revisions. It's all first to post, details be damned.
Unfortunately, there's been a race to the bottom going on in internet journalism that has led to multiple-posts-per-day from human journalists since long before LLM posts came on the scene. Granted, much of this tends to be pretty low quality "journalism," but typically, Ars was considered one of the better outlets.
You realise that those sites posted multiple articles per day ten years ago, long before LLMs were invented?
Yup. Now they do it with a fraction of the staff and use LLMs. What's your point?
Depends how much staff they have? You realize daily newspapers in cities all over the world are just full of new articles every day, written by real humans (or at least, they all used to be, and I hope they still are).
Lower than 2?
Uhhhhhh have you visited The Verge?