Update for anyone following along:
Admin reached out to me privately, rather than answering on the forum. Here is what they said about the sibling registry:
"While the Sibling Registry is no longer active, please rest assured that the data is securely retained. We remain committed to protecting the privacy of our clients and maintaining compliance with the changing legal regulations regarding data privacy. As such, we are no longer able to support the Sibling Registry in its previous format."
TRANSLATION: We promise we still know who consented to be placed on a sibling registry more than a year ago, but we will not be releasing that information to any of the parties who have already consented. Despite multiple reassurances over the past year that we would be bringing the sibling registry back.
"In addition to connecting with clients on the Community Forum, we also facilitate connections through our NW Cryobank Connections groups – as a result of your inquiry, we are in the process of creating a group for donor 141P. As with the Sibling Registry, membership to this group is optional as not all clients who report a pregnancy are interested in participating. Those who would like to join can submit a request form to do so – I have attached our request form should you wish to join. "
TRANSLATION: We are building a brand new registry with NONE of the past data included. In order to join, you have to notice that there's a forum, sign up for the forum, find the form to join the registry, SIGN A WAIVER THAT SAYS NW CRYO CAN KICK YOU OUT OF THE SIBLING REGISTRY FOR "NO REASON AT ALL," submit the form, wait for approval, and then remember to post and check the forum regularly.