This legend comes from the fact that HR people cannot be too explicit about the fact that you've been a pain in the ass (you could probably sue if it's too transparent), so if they have nothing positive to say they will commend your punctuality or something equally as mundane. It's not secret codes, it's like... "bless their heart", but in HR talk. Plausible deniability if you want to sue, I guess. "But it's a good thing, your honor! They were always on time!"