Pretty sure Yann is not involved in this - Meta has a separate GenAI group headed up by Ahmad Al-Dahle (@Ahmad_Al_Dahle).
LeCun is head of FAIR (FaceBook AI Research), which is a different internal organization than the GenAI group responsible for these Llama LLMs.
"I had some input on our open source policy but I had no direct technical input on Llama-3"