I think the content is largely AI generated with some human editing. It starts off feeling pretty human but then descends into robotitude from my POV. It could be entirely AI generated in which case the injection of references is pretty impressive.
The ending lets the whole thing down tho:
"In summary, embracing both SEO and content optimization within the entity SEO framework is strategically beneficial. It equips marketers for the complex and evolving demands of digital marketing."
That para slightly hurts my brain more the longer I look at it.
A major "tell" for me is when you find language which would be "ok" in a student's essay response creeping into what are meant to be tutorials or explanations - where that kind of language really sticks out as being waffle / useless words.