Yes. This should be treated as a serious management failure. Blame does not lie with the individual who made a simple mistake; it lies with the supervisory structure that allowed simple mistakes such as this to result in major data loss (and, as discussed in yesterday's thread [0], has made a series of other serious strategic mistakes that have likely caused them to end up with such inadequate internal hierarchies).
Something like this is not a mere oversight on the part of technical leadership; it's either negligence or incompetence. Whoever is responsible for GitLab's server infrastructure should be having very serious thoughts right now.
[0] https://news.ycombinator.com/item?id=13607890