I know nothing of the people or personalities involved...but this does not give me a good impression of the author. First, he never refers to anyone with a contrary opinion in any way other than "apologist". Second, he never addresses any other value than the unemployment rate as a number (for example, I can easily imagine an "apologist" being uninterested in his bet if they think he might be right about the numbers, but they value the regulation for other reasons). In never addressing their views, he dismisses them as unworthy.
I'm poorly versed in economics so I don't really have an opinion on the actual matter under debate...but I can easily see him writing a smug and self-congratulatory article on this topic that nonetheless gave me a better opinion of him.