The things I may want to learn or do in service of a hobby or personal interest are very different from those topics relevant to my professional life, and the motivations and the value I get from it are entirely different as well.
And this article is clearly written with a professional context in mind.
Unless you think that when he mentioned how his "software developer colleagues often ask me where I do get all the time for reading all the tech books or articles, watching conference talks and listening to podcasts," they were marveling at his woodworking hobby?