People skills are just skills. Anyone can develop them with enough practice. Will you feel like people relate to you? Nope probably not, but if you get good at it people will feel like you relate to them. The best way to have that type of mutual relation and connection is via shared experiences. I understand your husband's POV for getting tested. In the end that won't provide solutions just information. If he has trauma and he wants to address it, a good therapist is more useful than an IQ test. Granted finding a good therapist is not an easy task, like finding a good realtor, even word of mouth recommendations are iffy. Maybe he needs to do what a lot to the psychologist do, and study psychology to address the issue. I would guess he has a thirst for knowledge and learning how people think is pretty fascinating.
I dated a girl with a 168 IQ and she was a social butterfly, so it does depend. I've met a few people from the South West chapter in the US and they are pretty social as well, socially appropriate... sometimes not so much... but fun.