Yes, I think the article's goal is to rebrand the jack in a more positive light. "jack of all trades" takes on a generally negative connotation when you recall the rest of the phrase "...master of none".

Personally, I think one can become a master of a few things and a jack of many if one taps into the marvelous power of analogy and free association. It's literally a super power of the human brain that few people utilize. We're not meant to think linearly in most cases. Linear thinking is a necessary evil when solving already prescribed and well understood problem and a prison and barrier in all other cases.