AI can not meaningfully suffer consequences for what it does, and the trend is to remove the human from the loop more and more.
Furthermore, it's entirely conceivable that you have a law firm staffed by lawyers who more-or-less just say "yeah sure whatever" to what this thing does and, when asked about what can be done to appeal something, or how a document didn't make it into evidence, or how a subpoena wasn't filed, just shrug their shoulders and go "iunno". Vibe-practicing law, basically. You need to have an idea of how they're using AI and in what parts of the case.
It's ultimately his name on the documents submitted to the court.