People don't need LLMs to lie, and someone in the comments tells a similar experience. You can also find plenty of similar anecdotes using a search engine of your choice.
A lot of people use LLMs to clean up their sloppy text. Not realizing how fake it makes them sound. non-native speakers lacking confidence in their English are a type of llm abuser. It doesn't necessarily make the content fake.
You can even find many articles from specialized lawyers if you search in German: https://www.prinz.law/bewertungen/klage-zugestellt-wegen-neg...