Hmm. I think the article gets into a muddle in the Airstrip One-Gilead-Man in the High Castle paragraph. Or at least, it's imprecise.
The notion that Nazi ATLs get us inevitably and inherently tied up into Nazi ideology is clearly overegging it. People have already noted Fatherland which is clearly a story of relative political success for the Nazis but I think it would be strange reading to argue that it's a novel which validates the Nazis.
But Fatherland isn't a global success story for Nazism and definitely not for the Axis, and I think the writer may be differentiating that from "triumph" success stories, which yes, do very much open the way to validating the Nazis by their very premises. If you're gifting them vast, globe-spanning victories, giving them the power to drain the Med and conquer America, then you're basically delivering a backhanded compliment. And yes, I think we should be very wary of those scenarios.
That said, yes, Gilead and Airstrip One are fictionalised scenarios. But with real-world forces in the shape of religious fundamentalism and totalitarian Socialism behind them. 1984 is fiction but Orwell draws on a lot of archetypes he's experienced within Socialism for a lot of the characters and a lot of the currents within the regime. The Junior Anti-Sex League is very clearly drawn from his gripes with the, what was it, "vegetarian and nature-cure" side of things. It's a fictional regime, but also something of a Roman a clef. You have Trotsky and Stalin and the Old Bolsheviks.
But nobody would argue that Orwell's totalitarian world is a triumph scenario, because he makes it clear there's mass shortages of everything, everything smells of cabbage, the buildings are falling down and the booze tastes like piss. Oh and it's a commonplace for people to get killed on the streets by V2s. There's no hyper-efficiency and in fact no material success in the regime at all.
I think it would be odd, or at least navel-gazing, to locate the issue of mass market AH's attitude to the Nazis as some kind of internal problem purely for AH. It's clearly a very, very long-running thing in western pop culture as a whole. Making the Nazis sexy and/or cool, is clearly a deep-running strain within pop culture and I'm not sure we've seen the worst of it yet. It's fairly hard to imagine Man in the High Castle TV as really being much of a goer back when I was little. As time puts distance between us and WW2, this stuff may be more marketable.
I think the default popular cultural view about 'modern' authoritarianism outside the Nazis, of whatever stripe, tends towards the cabbage smell stereotype, (Though Mussolini and Fascism had their contemporary admirers, I think the cabbage smell view predominates today about Fascist Italy) but the opposite, 'cool' view does linger in western pop culture about the bad guys farther back - Napoleon to a degree, the Romans absolutely - there's certainly a view of the Romans as hyper-macho, hyper-efficient, hyper-militarised, and hyper-cool. And which does often have admirers on the far-right. Which depressingly suggests the equivalent Nazi mythologising may be something we have to contend with for, well, quite a while putting it mildly.
Ultimately I think we are talking about the battle between power-worship and moral clearsightedness, and that is probably an eternal concern.