Also to be clear GitLab (apparently) didn't lose any data actually stored in git from that timeframe, "just" the data stored via GitLab itself (issues, wikis, etc).
It's of course still bad because GitLab makes a big deal of being about the "whole package" rather than just version control, but it's not the massive potential for intellectual property loss "six hours of data" implies for what most think of primarily as a git hosting service.