What good are status pages if they don't report on actual outages? Same 503 error now for a while. Seems like a CDN issue.
Github is up, it's your connection. Try using Tor Browser, VPN, or cellular to connect.
There was a regional issue for several hours. Just because a site is working for you doesn't mean that there are not issues. That being said, it appears to be resolved as of now (at least for me).