This is an invitation only reciprocal friends group. You basically had to have some social interaction with the organizer, other than a meetup, to get in the group. If you have been to his meetups for years, without any social interaction outside a meetup, your chances of getting in are slim. Making the effort to make friends matters. Membership is by invitation only and limited to people that made the effort.
It's about getting to know people on a more personal level. In this case, less is more.