Status page says "Incident with Pull Requests". Pull requests status is listed as "Normal". Status text says issue with degraded performance for Webhooks and Issues, does not mention Pull Requests.
I would give that a 5/10 accuracy at best!
they've updated the page since then. Take a look
The status page has been updated. PR and webhook statused red and now listed as "Incident".
(Disclosure: GitHub employee)
As someone who is partially responsible for supporting github at a very large organization, no it isn't. At least not until the incident is at least 30m old if ever.