If you're going to spend 33% of your life around a group of people, it seems like the most rational choice would be to choose a group of people you know something about, understand and enjoy, right? Getting lots of work done in isolation in a cold, hostile environment surrounded by strangers seems to me like a worse choice than getting less work done with fun people you enjoy, with the feeling like you're all in it together and can rely on each other to handle challenges bigger than any single person as a team. Life's not just about getting the most work done possible before you die, right?
What does he do with that information? Is it just idle chit chat that has no effect on the team, or does he try to improve/resolve work situations that come up in discussion when you're feeling low and help celebrate successes and reinforce positive patterns when you're feeling high?
As an NT, could you help me understand your feelings towards this event? I would really enjoy learning more about my coworkers and what is meaningful to them. It sounds like it would reinforce team bonds and help me understand my coworkers beyond their just their superficial work layer. I'm sure they have fun interests and experiences to share which we might even have in common and nerd out about, or grow into a new interest for me that could enrich my life.
What are you hoping to achieve? If you don't like this person and they make you feel tense, unworthy, and like you're walking on eggshells, you don't need to "prove" they're a narcissist. Even if they're just an asshole, the solution is the same. Stop talking to them and leave.
Apple adjacent?