The person who posted on reddit was referring to how Norm Kelley's Twitter account is run.
Amongst other indicators of that, the comment is a week old and refers to a time before then - i.e., to a guy who "used to" work for Ford. (IIRC correctly, the last person to exit Ford's office was McEacheran, and that was months ago.) Kelly's Twitter account has been 'famous' for some time now (e.g., the Drake nonsense). Until only a couple of weeks ago the tweets on Rob Ford's account were little more than announcements of events he did not attend and "thanks buddy" replies to a few supporters.
It is believable that Kelly writes some of his own tweets. It is beyond belief that Ford does - and even farther beyond belief (if that is possible) that any of the more recent ones have been composed by him.