This is comparing LLMs to the best humans, and concludes that LLM output is "nonsense". Well, LLM output is better than the average human's output, and there are a many of humans at and below the average.

For four billion people, using an LLM to create things is a marked improvement. I'm not sure how you'd explain the phenomenally widespread use of LLMs otherwise.

By the way: Can you tell whether my comment (this one) was written by an LLM or not?