I'd consider yourself lucky when it comes to Github post-mortems. They seem to respond very quickly when it comes to a large event. Compared to AWS write ups which can come week(s) after the event after all data has been gathered and a summary written.

I don't believe any company that is smart would put out a writeup as quickly as possible if they weren't sure of the facts, that just doesn't help anyone out if the company is spreading unverified information. Plus developers need to be focused on fixing the actual problem and root causes first, pretty write ups come second.

For upto the second info the status page should be more than enough.