I think he found himself in the same position as everybody who looks at this dispassionately. Professor Moon is certainly no fan or friend of either of us, but he found that, as a fair-minded man, when you look at section 13 in the cold light of day it's completely indefensible.
He also made the point that it is unworkable in the age of the Internet, unless Canada is prepared to take the kinds of actions China does with websites. You simply cannot enforce this law in the modern age. You get what is always the worst aspect of tyranny--a kind of capricious tyranny that just alights on certain easy targets and ignores far more problematic ones. For that reason, Richard Moon concluded that whatever his own feelings about a lot of the speech out there, section 13 only made the situation worse.