He asked for "OPINION". What I stated is my OPINION. Only "B" contests or Cr events can be restricted to any specific group of AMA members.

If some individual knows that a club, group, and/or CD is restricting otherwise then take it up with the AMA.

That is RIGHT.

If a AMA chartered club makes rules/restrictions for that specific Club, then such is up to that club's members as long as it is within the directives of AMA.

I consider the above to provide 2 choices: 1) Join the club and try to make changes if they so need changing, and/or 2) Mind one's own business.

IMO that is the RIGHT thing and it does appear to be the legal thing. I don't see any need for any additional decoding.