Fun fact: I worked at a medium-sized music distributor, and Apple actually gives distributors a "score" based on how close they are to the style guide.

If your score falls below a certain threshold the time between delivery of your content to Apple and when it goes on the store is delayed because of additional quality controls applied to your content.

If you have a good score, it will go live immediately (assuming it's release date is in the past).

Lots of software development at this company was driven directly by changes to this style guide, since iTunes / Apple music were such a huge portion of revenue.