Credit where credit is due
Copyright in all forms has always been something of a double edged sword and I think the importance depends on your platform.
If I wrote a song which charted at number one then I definitely want to be seen as the copyright holder as I would earn money. Clearly any kind of artist deserves credit for their work and this article calls for clarity in this particular scenario. It could be argued that derivative works are sometimes created by 'standing on the shoulders of giants' and that the bulk of work has already been done by the original author. The opposing argument says that the derivation might be considered superior to the original (e.g. Shakespeare).
Perhaps I am labouring the point. We are talking about free open source distributions and in principle I agree with the purpose of the article that clarity is important. Credit where credit is due!