What a load of bollocks.
Here is how the music business works (which is more about BUSINESS than it is about MUSIC) :
Most of the revenues go to the record company. By "most" I mean vast majority, although their profit may not be huge, depending upon production costs (yes, even for a box set), marketing (yes even for a box set). logistics and distribution (yes etc) and so on.
The (small) percentage to the artiste (who is not necessarily the songwriter, so he gets performance income not songwriting royalties) may be clawed back by the record company because when they fork over dollops of cash to sign an artiste and pay for time in the studio (and the producer, engineer)(and the music video etc) that is either all or a large portion an ADVANCE to the artiste.
Now you now why so many performers are permanently teetering on the edge of bankruptcy. As soon as they get the advance they spend it on ... well you don't need me to tell you that... so when their first album flops they are deeply in debt,
Welcome to the music biz.