I have read your comment before reading the article, and at that time I have thought that you must be right. Nevertheless, after reading the article I have see

I have read your comment before reading the article, and at that time I have thought that you must be right. Nevertheless, after reading the article I have seen that the clarification about the gorilla sleeping without a pillow made perfect sense in its context, because it has not been added to provide any additional information, but it was added for emphasis, in a context where the sleeping positions in modern environments were contrasted with their correspondents that are common both in non-modernized environments and for similar primates. Moreover, I interpret his phrase "To start with" as having the same meaning as your suggestion "newbies". Using a door frame in the beginning is indeed good practical advice for achieving the full squat position for those who are not used to it.