It's good to have a post mortem. But this was not actually a post mortem. They still don't know how it could happen. Essentially, how can they write "We’re too tired to figure it out right now." and right after attempt to answer "What have we learned? Why won’t this happen again?" Well obviously you have not learned the key lesson yet since you don't know what it is! And how can you even dream of claiming to guarantee that it won't happen again before you know the root cause?

Get some sleep, do a thorough investigation, and the results of that are the post mortem that we would like published and where you learn from.

Publishing some premature thoughts without actual insight is not helping anybody. It will just invite the hate that you are seeing in this thread.