Unless you can write a good-sounding reason why it's on them to review a LLM output before sending it to you, they will outsources this reviewing to you, and it's a lot of reviewing.
Original comment stated that it was 10 documents, all LLM-generated.
In my experience, it does take a lot time and effort to find contradictions between 10 documents. Even with good documentation, it's hard to build a mental map for that amount of information.
If it's genuinely hard to find that single bug .. perhaps the document has reached the quality required for corporate communication?