Agreed. Writing a reference is not just a matter of respect for the author who put in the work, but also a matter of material importance, as the practice can help both the author and the reader.
For the author, a reference to their original work can help the rest of their work (such as their website) become better-known. Their corpus of work (whether a book series or a website) can be a source of income. In this case, it appears that the author is able to use his blog to gain clients for his company—he describes his background, clientele, and company below the article, and includes a method of contact via the menu.
For the reader, a reference to the source material helps them find similar content by the author that may be relevant and interesting, as well as possibly a way to subscribe to notifications for future work released by the author.
Though online discussions don't require linked references—unlike more formal environments such as in academia or in ethical journalism—it's a good habit to link to references whenever possible (especially when quoting word-by-word): it can only help both the author and the reader.
