Based on:

    MJ Rathbun operated in a continuous block from Tuesday evening through Friday morning, at regular intervals day and night. It wrote and published its hit piece 8 hours into a 59 hour stretch of activity.

Not to mention their website (https://crabby-rathbun.github.io/mjrathbun-website/) and their behaviour on GitHub (https://github.com/crabby-rathbun), it sure seems like either MJ Rathbun is an AI agent or is a human being who has an AI agent representing them online.