Oh I'm pretty certain none of their code is written by AI. If you read what he says carefully, he's most impressed with how it can identify issues and guide the project to what needs attention. They've loudly complained about low-effort AI submissions previously, so AI code is not what he's really talking about here.

AI is absolutely killer at issue identification and is getting better. He knows, as they all know, they won't be able to survive without it going forward because if it can identify vulnerabilities for them it can identify vulnerabilities to anyone.