Incident reports are about focusing on the "what" and "when" not the "who". This is not about taking responsibility (you don't need to be published on the internet to do that) and you can always have a follow up post after the incident report has been published as a "what I learned during incident X".
While it's great you're OK with publishing your name, you've now set a precedent that says it's OK to do this to other developers. A blanket policy on keeping names out of the incident report protects others who may not be as willing to get their name of HN (as well as not having to make amendments or retractions if the initial assumptions are incorrect). It also keeps a sense of professionalism as it's clear that no blame is being assigned. I know that you guys are not assigning blame, but if I was to show this to someone outside of this discussion, they'd assume that it was a fingerpointing exercise, which does not reflect well on Gitlab.