I don't know who he is, but he's not Paul Graham. The story behind that is that pg emailed me on April Fool's asking me to help him with a hoax to make it look like he was really nickb, who was the most prolific contributor on the site at the time. pg just manually changed the account name on a reply to make it look like he was accidentally replying under the wrong username, and my job was to submit a story looking like I had discovered this.
(This was also already publicly discussed somewhere on HN previously, albeit several years ago.)
(This was also already publicly discussed somewhere on HN previously, albeit several years ago.)