It looks like they're relying on tracked changes and human review, but I didn't see anything addressing something that has frequently made the news: LLMs outright hallucinating cases or holdings.

If the human lawyers don't catch that on review, they're likely to have an angry judge and an AI saying "absolutely, you were right to call me out on that, I shouldn't have hallucinated a non-existent case and made the judge sanction you."