That don't actually say it's a blame free post-mortem, nor is it worded as such. They do say it's their policy not to publish AI generated anything unless specifically labelled. So the assumption would be that someone didn't follow policy and there will be repercussions.

The problem is people on the Internet, hn included, always howl for maximalist repercussions every time. ie someone should be fired. I don't see that as a healthy or proportionate response, I hope they just reinforce that policy and everyone keeps their jobs and learns a little.