Working under LeCun but outside of Zuckerberg's sphere of influence sure sounds like a dream job.
Really? From where I'm standing LeCun is a pompous researcher who had early success in his career, and has been capitalizing on that ever since. Have you read any of his papers from the last 20 years? 90% of his citations are to his own previous papers. From there, he missed the boat on LLMs and is now pretending everyone else is wrong so that he can feel better about it.
His research group have introduced some pretty impactful research and open source models.
https://ai.meta.com/research/
For the same reason I don't attribute those successes to Zuckerberg I don't attribute them to LeCun either.