I think a hallucinated sentence embedded in a paragraph of truth fits the definition: stupid and nonsense. A bullshitter can be right sometimes or even most of the time. They are still a bullshitter.
I have to wonder if I ask an LLM enough times, if it would give an answer about whale blubber that involved whale farts. That parent may have read it or heard it somewhere else, and the LLMs may also have that disinformation.
"Garbage in, garbage out" is definitely something humans and LLMs share in common.