It's good parenting to be aware of that sort of thing, but as you seem to guess I wouldn't worry too much. Kids are kind of just like that. I have a 13 yr old in my life right now and she is pretty similar, so I think it's healthy. The last thing we want to do as adults is make them feel small or like their thoughts and interests don't matter.
For what it's worth I don't mind talkers, it really is just about place/time/topic. I'm sure he'll make it through. I hear encouraging questions about others helps, "thank you for asking"/"what a great question" etc. but I don't know if it really helps so much as is something we do in the interim to feel like we're helping while they just mature in the background. Seems like you're on top of it though. Best of luck to you both!
The cringe is so real. I had a guy bring his gaming laptop to a third date at my place. I was super into him and we went to my bedroom and he just set up his laptop. I could not pull him away from showing me his cool single player gaming collection. It's my fault because I kept going out with guys I met at cons. After the third time you think I'd learn my lesson but I didn't stop until poly became more pervasive and I ended up on dates with people who just forgot to mention that. I don't mind poly but you should be upfront about it. So glad I don't have to date anymore. It's an absolute disaster out there. Best of luck to everyone still doing it.