Think of it like having a secret engagement. The engagement is real, and you and your intended know about it. You plan to make an announcement on a certain date, but then decide a later date will work better.How do you delay something that isn’t announced? These post are always strange.
The fact that no one knows about it (except for maybe a close friend or two who can't keep a secret, and anyone else that they might have told, and anyone who reads their gossip on social media) doesn't mean the engagement or the delayed official announcement any less real.