[CarlitoBrigante]

No, if you read the file further, you will see that the result of the query is used only to generate the css file into the directory. After that, you still have to add the path to the headinclude, as I said above. That is why I said the method in the article is still valid, but you need also to add the link to the CSS file... which makes the whole purpose of this article meaningless

A way of having your custom CSS added to the generated files would be to assign it a template type of "css"; but I think you can do this via XML file only (or query), and I am not sure of consequences as I have not explored the possibility.

In brief, easier to use a simple template hook, even though I can understand that some want to have products self contained in an XML file. This would be possible if the developers added a template hook into additional.css.