I've lost count recently of how many times Claude has given me something in this style that I can't understand, and then I ask it to rework parts of it, and then it tells me that the original things it claimed weren't actually quite right anyway.

I'm starting to read it as a sign of low LLM effort not just low human effort. It seems most common when one few-sentence prompt leads it to generate 4+ paragraphs (and the longer the output, the worse the odds). Prompting to dig into each resulting paragraph one by one, to make them readable, makes it do higher-effort deep dives.