""Eurocentric forms of art, such as ballet or piano, those who excel in other forms of art, such as South Asian dance or slam poetry" may not do well in admission auditions."

I'm not even sure whether their report is well informed. I thought you have to be auditioning for National Ballet or Julliard preparatory division to be considered to be learning some ballet or piano. Schools like Etobicoke or Claude Watson is not a training ground for ballet dancers or pianists. Public schools can teach Fine Arts, Acting, Jazz, Musical Theatre but not the above mentioned Olympic sports of performing arts. Arts high schools are there to support students to spend more time engaged in developing their talents by being flexible in academic curriculum but they do not do a whole lot of arts teaching because people who teach in public school system are not artists.