That's not what he meant at all.
It's simply a hard ban on mods, regardless of what they do or don't do. It's simply a much more time efficient way than having to make a ruling on every single mod someone may or may not want to use, which may or may not affect gameplay, and may or may not be advantageous to some players and not others.
Besides, it's better to learn it now, than to complete a whole HoF Dynasty, mention it then, and find out you're disqualified, right?