Я получил ответ от Gitlab Surport, они изменили контроль доступа!
Tristan Williams (GitLab, Inc.)
Nov 3, 22:46 EST
Hey there,
Thanks for contacting GitLab Support.
You most likely need to adjust the access level of the Pages portion of the repository associated with that GitLab Pages site, since we recently enabled access control for Pages on GitLab.com. To do so, navigate to Settings -> General -> Visibility, project features, permissions and toggle the Pages access to Everyone with access.
All the best,
Tristan Williams
GitLab, Inc.