Well, first off, you have to go a little deeper than a statement of the overall policy and into the Act itself.
As a shorcut, let's do the section headings of potentially applicable sections.
§ 3601. Declaration of policy
§ 3602. Definitions
§ 3603. Effective dates of certain prohibitions
§ 3604. Discrimination in the sale or rental of housing and other prohibited practices
§ 3605. Discrimination in residential real estate-related transactions
§ 3606. Discrimination in the provision of brokerage services
§ 3607. Religious organization or private club exemption
I think the main thing they're relying on is the discrimination occurs in the membership in the PMA, which is not any sort of real-estate transaction or rental or sale of housing.
Then, once you're in the PMA, you buy shares in the LLC, again not a sale or rental of real property, which entitles you to build on and otherwise exercise ownership attributes over a chunk of the land.
So, I think it literally probably evades the terms of the statutes. And maybe they're trying to squeeze into that religious/private club exemption.
I think historically, this probably won't work. But with Ruckus & Co., who knows anymore.