There's nothing that a school like this can teach to a musician unless they are inexperienced/talentless musicians.
So Timmy the wannabe rockstar goes to their school. After their "education" and if he meets all the requirements for being a dumb rockstar he will be put in contact with the right agencies. A record deal follows complete with a deal about publicity in the form of TV appearances, video clips, kids movies, etc. Kinda like the people who win those "talent contests" on TV.
All the other kids are screwed of course, wasting their money on washed up B- and C-celebrities teaching them what they could have learned over the internet and by simply practicing. Classical musicians can hire themselves out to orchestras if they have the proper training but what is a random metal band gonna do with this education? You still end up following the same path as any other artist who's looking for big fame.
I could see a benefit for having formally educated producers of course, particularly in death metal. But there's a danger of having too polished production too, especially when producers are used to making a commercial product.
Comparing this to "Black Metal Symposia" I'm wondering why it's so hard to create a middle ground, something that focuses on both the art form and the commercial aspects. But then it would be "half commercial garbage, half pseudo-intellectual dreck" I guess. Makes me wonder if metal even belongs in schools other than in contemporary art history since atm metal's only hope is small local bands creating a new scene instead of new celebrities leeching on a bigger scene that's dead anyway.