He’s lying. In the transcript, he asked ChatGPT, “are the cases real? … are you sure?” That means in his mind he knew ChatGPT is capable of making things up and

He’s lying. In the transcript, he asked ChatGPT, “are the cases real? … are you sure?” That means in his mind he knew ChatGPT is capable of making things up and wanted to verify. He’s just lazy and didn’t do a simple external verification. May he knew that if he did an external verification and the cites turned out to be false, he had to rewrite the whole brief.