One of the traditions that the BIORC holds to, enforced by our secrecy oath, is that only the individual member themselves have the right to reveal their membership in the tradition. Unless the member themselves steps out of the broom closet or the Vault, their membership is considered a SECRET.
Furthermore, the details of their lives and how much they share about themselves is determined by themselves. In addition, they have the right to write under a motto and never have to reveal their real legal name or any other identifiying information to the public.
(I am sure that I do not have to remind anyone of what happened to Westcott according to the famous story told by Crowley.)
This is a really old custom if you believe the history of the Rosicrucian tradition. Think about it. How much do you really know about the founder of the RC tradition? Do you ever know his name? Do you know anything about him beyond the information contained in the three original RC manifestoes?