You’re right man. This writer uses the term “serious music” giving for a fact that classical and jazz are better than other genres. There is no way to measure what kind of music is the best, this isn’t an sports event were someone wins and other loses.
Music schools methods promote competition, like if playing faster of “harder” songs makes you a better musician over all. In fact, most musicians i know (lots) quit music school and kept studying by themselves, considering their former classes annoying and “hard for no reason”.