The article also postulates that due to the threat caused by people outside the academy/media/"cathedral", the overton window has shifted sharply in a radical direction in order to flush out those who are insufficiently loyal.
And if I recall correctly, that this is a regular process. Which has led us to this rather extreme point, historically near the extreme for the US.
What are the specific counter-reactions you see that limit this as an ongoing/regularly exercised pattern?
(This isn't really my opinion, I don't have good enough evidence for or against; it's just my understanding of the claims of the article.)
This erroneous concept seems to have spread to this writer via Curtis Yarvin (of Urbit/Strange Loop fame/infamy.)
It seems superficially valid because the media loves to use witnesses of academic prestige that back its own agenda. However, it should be clear that the ultimate gatekeeper has always been the media, not any media-selected credentialed proponents of whatever position the media wants to be seen as the most prestigious and scientifically valid.
If universities are really brainwashing people, then those who own the media can just not hire those brainwashed people. Power over hiring is the ultimate level of control over any organization, media companies included.
You can make the argument that the media needs an audience, and if the masses are brainwashed then they have to speak in that language. But if you're talking about non-objective-truths such as values, and those values are so widespread that media has to cater to them - that's not brainwashing, that's just popular culture.
Now, there is some distance from "radical libertarian think tanks" and the rest, but, for example, can you find any serious distance between any 4 of these groups on immigration? Use of marijuana? And libertarians are a relatively small, and in the US, a disintegrating group.
I'm sure there's enough diversity of opinion between televangelists for some of them to be on board with feminism, but that's more a sign that the US has less of a religious Establishment than many countries rather than more.