I think that the "pleasure" one gets from art is longer lasting than that provided by a piece of candy. This could be easily tested by doing a series of evaluations at later dates.
I used scare quotes as it seems misguided to attempt to analyze such diverse points of human experience with the metric of "pleasure" alone.
Art and similar activities carry much more meaning and significance than candy, thus have they have a larger effect on an individual's life and broader society. Surprisingly, this obvious point was not mentioned in the article.
Of course, we may not yet have instruments that can accurately assess these more nuanced differences.