A journal operated double blind peer-review, so the reviewers do not know the identity of the authors, and vice versa. However, the anonymity of the authors is not guaranteed, as the reviewers may discover the identity of the authors (because of the area of research, references, writing style, etc). But rarely can the authors identify the reviewers.
The journal received a request from a reviewer to share a post on twitter, which may disclose the reviewer’s identity to the authors.