BAM!This article is conflating like six different theories of political power, and the result is gibberish.
This article, which I admittedly merely skimmed, conflates a bunch of different theories, applies them all indiscriminately, and lumps them all under an inaccurate heading.
Class struggle can take many forms, the most popular currently being the 'rich-vs-poor' narrative, but that is far from the only one extant, both today and in the past. My personal expertise is Nazi Germany, where many of the wealthy were basically bigger slaves to the state than the poor were.