If I’m not mistaken, the connection can be as remote as that Vance and the other person were both recipients in the TO: field of the same email at some point in the past.
Any time I’ve signed up for any app or website and gave it permission to read my contacts, that was where the loosest connections it made came from, the head scratchers. When I searched for them in my contacts I found no direct contact, but when I searched for them in email I found that once long ago we were both recipients of a big group email for whatever reason.
On the other hand, I don’t look kindly upon this Vance fellow and I’m happy to suppose that he’s directly connected to turds like Carlson et al.