Are you certain it is the exact same comment or post? I think people are deleting everything (via scripts or whatever–some scripts are known to not work/only appear to be working–particularly ones that make use of pushshift which reddit destroyed a few months prior to this incident), but everything isn’t actually everything because of the way reddit hides content in certain situations. When people have posted screenshots it has been content from subreddits that had be set private during protests and reopened. Reddit annoyingly hides your own content from yourself in many circumstances.

I’m not saying these undeletes definitely do not happen, but people have needed to delete content on Reddit for reasons the pre-date the protests. The legal risks to reddit for them to be caught restoring content that a user deliberately deleted is significant. So unless a whistleblower or compelling evidence emerges Occam’s razor will go with reddit bugs and “features”. Everyone knows reddit is bug-ridden.