I was wary of this due to the somewhat clickbaity title, but the video itself is good fun. Made me smile.
If I have one criticism, it's that I couldn't quite tell from the tone whether you were aware of the intentional, satirical aspects of the Escher background. You bring up a lot of 70s and 80s way-out feminist fringe thought (I'm referring to Solanas and the other 'kill all men' stuff here), but there seem to be only two possibilities that you consider:
a) the Escher are a political statement promoting misandry and the rule of women (and thus highly flammable on the internet)
b) the Escher are a science-fictional thought experiment about an unusual social situation (and thus only moderately flammable on the internet).
I may have missed it because I watched the video at midnight, but it seems to me that you missed possibility C: the Escher are a
satire on radical feminism. At least in their original 90s incarnation. The current N17 fluff is probably an attempt to work backwards from that to give them a credible backstory.
I find this omission odd because to me it's by far the most obvious and likely of the three. Especially given that the writers were all men, and thus presumably not inclined to seriously promote option A. And particularly because
everything in Warhammer was originally intended as satire, if not outright parody.
I also notice (OK, two criticisms) that you didn't say much about the Amazon archetype, which is the bedrock for much of the Escher background. Not just 'women who rule men', i.e. matriarchy, but women who live apart from men, who have as little to do with men as possible other than what's necessary for reproduction, and who have to be excellent fighters in order to stop all the men in all the surrounding countries doing the usual 'hey, free wives and bed slaves!' thing that men throughout history do. You do hit on that last point when talking about the Escher deliberately cultivating a reputation for cruelty.
(Incidentally, one way for women to fight on equal terms with men in a pre-industrial society is horseback archery. It's the ancient equivalent of the gun as equaliser. Don't think it's a coincidence that the legends of the Amazons sprang up around the lands of the Sarmatians and other horse-based cultures.)
It's as much a male fantasy as it is a radical feminist one. Partly a sexual one, yes... but also a fearful fantasy of "what if our positions were reversed?"
IIRC the chauvinistic ancient Greeks thought of women-in-charge as a fascinating nightmare of the world gone wrong or turned upside down, much like slaves making the laws or the the dead coming back to life. It gives voice to a deep-seated (and maybe concrete and biological) fear that men aren't just expendable but redundant. If women died out, humans would go extinct, but if men died out--or if women decided to get rid of them--the species could feasibly continue. It wouldn't be easy, but it could be done. Happens naturally via evolution all the time when some lizard species or other starts self-fertilising for whatever reason. (And then that lizard goes extinct a few million years later due to the Red Queen, but those were a few million years of
amazonian bliss, gosh darnit.)
The other bit of historical inspiration I was hoping you'd touch on (yeah, yeah, I know, three criticisms, it's all gone Spanish Inquisition in here): the precursors to the Escher in Games Workshop material itself. I don't know if it's ever been outright stated officially, but I reckon the Escher are recycled concepts from early Warhammer Fantasy. Way back in 1st edition WFB, we had the Amazons. They had punk hairstyles, reproduced without the aid of men, and generally parodied the British feminism of the time... and wielded bolt pistols and power weapons. Yep, in Fantasy. It was a lot more gonzo and sci-fi back then. Frogs from space and all. See this artwork for instance:
The Amazons' homeland, Lustria, was the first-ever properly fleshed-out setting in Warhammer Fantasy. Even before the Old World. But the focus shifted across the sea soon afterward, their creator (Richard Halliwell) moved on from
GW, and by the time Lustria came back (in 5th edition in the 90s), the Amazons had receded into the shadows and never really showed up again. One of the few tentative attempts to update them was made in 6th edition WFB by none other than Andy Hoare. I don't think it's a coincidence that the current N17 Escher have kinda jungle-tribal trappings.
I'm pretty sure that Jes Goodwin and rest of the 90s team repurposed the old gun-wielding Amazon designs for Necromunda, where to be honest they fit in much better.
What I'm saying, basically, is Escher are the most fundamentally Warhammery thing it is possible to be. Even more so than Chaos. They're like the Tom Bombadil of Warhammer. First and oldest.
A few other random thoughts:
- I'd never thought about how the Escher see the Emperor. Innnteresting.

I agree they probably see him as exceptional and different, in much the way that historically male-dominated cultures have seen female rulers as 'transcending' the limitations of their sex. I recently read a fascinating 80s book about this (though how it's regarded these days I'm not sure)--
The Warrior Queens by Antonia Fraser. Worth checking out.
- If the Eschers' DNA damage is sex-linked, it's presumably on the X chromosome, which is why it's usually males who are affected. Women have a backup.
- Escher women are presumably 'gay for the stay' much like women in prison, except for them it's their whole life. (Edit: Another comparison could be to cultures with pervasive sex segregation, where men hang out mostly with other men and women with other women, and can't be seen in public together. Men, at least, in such cultures often appear bisexual because they just don't have much opportunity to get it on with the other sex. Women seem better able to just switch it off altogether, or at least keep it very quiet due to social pressure, but House Escher is an unusual case and the latter at least wouldn't apply.)
- In case you're not already aware, in Adeptus Titanicus, there's now officially a Titan Legion (Solaria aka the Imperial Hunters) who are pretty much 30K Escher equivalents with giant robots. The Amazon conquest of the galaxy continues.