I have been following the SEO speculation since its inception and it is nothing other than that- speculation. No one knows anything and Google is constantly refining. While this article seeks to debunk that atmosphere of fake expertise, it devolves into more pseudo SEO ‘science’, none of which tells us anything. The only thing we ‘know’ is what Google has constantly said publicly: Publish the best quality, most relevant, least self-serving content (answers) for the specific search questions your market is asking.
This is a quality issue for Google. If they don’t provide the best, most helpful answers, searchers will go elsewhere. And it is not in their interest to offer up any information that helps people game the system, which is what SEO is. You’re far better off studying UI/UX where there are many research studies that offer facts on how users interact with digital information. Not this mumbo-jumbo.