The whole idea of "hard, manly men from hard, manly places vs decadent effeminate empire corrupted by too much luxury" is pretty dubious as well. Very little basis in actual history, quite a lot of connections to 19th century racist nationalism not to mention modern far-right thinking.
I've only read the 1st, and a bit of the 2nd, of that series you linked, but I think that guy fundamentally misunderstands
Dune, the Fremen, and the Fremen's role in
Dune. He's, unsurprisingly for a history professor, right about the history he's talking about, but he's wrong about the pop culture - he is, in fact, making the same kind of mistake he's accusing other people of making.
It isn't a story of the Fremen defeating a fully industrialized culture, it's a story of one faction of that industrialized culture - the Atreides - exploiting the Fremen as shock troops to help them defeat another faction. The book is very, very clear about this - the key Atreides characters all mehtion and/or think about it repeatedly, incessantly in fact. A huge point in the story is Jessica + Paul cynically exploiting all the Bene Gesserit implanted religious mythology (Missionaria Protectiva) to manipulate the Fremen into becoming his fanatical followers. Their victory over the Harkonnens and the Emperor is achieved only with the help of 1) Atreides nuclear weapons 2) Atreides high-politicking and 3) Paul's superpowers. You could say the same thing about the Sardaukaur, who are a tool of the Imperial Throne rather than a military power in their own right.
The real-world analog for the Fremen isn't a tribal culture defeating an industrialized culture, it's a tribal culture being exploited as shock troops for empire, for which history provides many examples: Roman
foederati, Highland Scots in the British Army, etc. The author himself mentions the Byzantine + Persian use of Arab auxiliaries in their pre-Islamic forever war.