The problem isn't just that spez had an act of weakness - it's that reddits admin tools have built in features to modify comments. Meaning they're using that feature more than just this singular time.
Do we know for the a fact that those tools exist? I work on a website that has a database backend. It is trivially for me to go into the database and make any edits I want. How do we know that he doesn't have that kind of database access?