Well, LLMs can be either side of that. They can also be used to turn something verbose into a series of bullet points.

I agree that reading an LLM-produced essay is a waste of time and (human) attention. But in the case of overly-verbose human writing, it's the human that's wasting my time[1], and the LLM is gzip'ing the spew.

[1] Looking at you, New Yorker magazine.