Currently it does, indeed. From my Slack logs, at 15:00 UTC I noticed problems. I'm pretty sure that message is manually created, at least 41 minutes after the fact.
Recently, more and more of them take 10-15 minutes until they mention a service outage. I don't work in super HA, I don't want to get an alarm because a single ping failed etc, so I'm lenient and have a few minutes of a delay in alarms. If I'm writing an internal incident report before the official status page is updated, that's bad.
This seems similar: external users noticing the outage and posting on HN before GitHub notices & acknowledges it.