You'd have to copy/paste a serious chunk of code you don't understand to really cause any damage. I think this comment is either taking the pun or misguided.
Reader mode exposes the full text of the command, if anyone is wondering and doesn’t feel like doing exactly what the post is telling you not to do.
He/she is making a joke. No user data was accessed so the assumption is questions may have been, a couple pluses changed to minuses could cause a lot of damage (headaches?) when copy pasting.
It didn't say no user data was accessed. It said "We have not identified any breach of customer or user data" Which likely means the attacker had access to user data but there was way to know if they did or did not access it.