He looks fine to me. I don't think he's stressed, if anything I'd say it's like how he shared his view on AI. Before he was stressed and concerned, and now he feels like if it happens it happens. You put in your work, do what you can, and own who you are.

I found it highly inspiring and really admire the candor without a fake personality.

Why do we have to "act" in society even as CEO's? Be human, and do your best.