> How did the author couple enjoyment with nonproductive?

By considering "use of free time for enjoyment" too narrow. Supposedly because he thinks that "meaningful" is distinct from "enjoyable".

I'm sorry if I phrased that sentence wrong. I certainly don't think "enjoyable" things are "non-productive". In fact I think that the things we truly enjoy are likely to be some of the most productive things we do.

I understand what you were trying to say, but I don't remember reading anything that indicated this was his opinion.