I think you're blowing it out of proportion. If you showed it to someone and they told you they assumed it was about fingerpo...Look, it's not that big a deal. They decided to do it, not everything is a blame game.
Heck, they didn't even say to retract anything from the report, just maybe to leave adding names to things until a later date in future incidents.
"It also keeps a sense of professionalism as it's clear that no blame is being assigned" is not the same as "you guys acted unprofessionally!". It's letting the GitLab guys know there's a potential problem with the communication style at that point in the story.
I find it funny that in a comments section full of comments about allowing a frank learning experience you're being so down on someone giving tips to consider learning from.