You’ve gotten the answer. You might not like the answer, but you’ve gotten it. Without venturing too far into OMNI territory, any rule is followed as much as the followers respect the authority of the issuer and the reasoning behind the rule, and have weighed the costs and benefits of both compliance and noncompliance. Compliance is never 100% (see also: unpermitted construction, workplace policies, speeding, drugs, even murder… the list goes forever). With an unpopular mandate, even those charged with enforcing it may feel little motivation to get kicked in the teeth again and again enforcing a rule they don’t agree with or possibly don’t even care about. I’m not commenting on the validity of any particular opinions on this topic, merely factually observing human behavior.
You should write to AA if you feel they are not delivering on the lounge membership you paid for, and wish a refund or for them to step up enforcement.