This book was published by Regnery in their ISI Books line and if you look at the rest of their catalog (https://www.regnery.com/books/isi-books/) there's a certain theme that's overwhelming. To be slightly more explicit, when so many of their other books are so obviously by and for right wing culture warriors, why would they have published this one if it was not?
(And if you look outside that particular imprint the publisher's politics become even more obvious)
If you check the bibliography of this article's author, his latest book seems to be a wistful longing for Che Guevara and the Cuban Revolution.
The greatest "myth" I'm seeing in this thread is the idea of objective pop history writers (or readers). All of these works are goods being sold to a consumer audience. Perhaps in decades past, many consumers favored works that expanded or challenged their worldviews. But in today's zeitgeist, most consumers want to read things that reinforce how they view the world already.
> There are some conservative books there, but also general topics too.
And that's exactly what to expect from a conservative library! There's no left-wing book, at all, in the shelves and that's a pretty clear sign.
We can't know for sure if the “general topics” are themselves conservative, but the complete lack of left-wing PoV in collection, that doesn't bode well.
but the claim wasn't that is was a "a conservative library" (consisting or specialising in having of a large amount of conservative titles, presumably for conservatives) - but that it (or a large selection of its titles) caters to RW culture warriors, to the extent that you ask "why would they have published this one if it was not?", i.e. it cannot be merely conservative, but assumed RW-extreme.
Of course the term “right wing culture warrior” is questionable, but when your library is so right leaning that its political orientation is obvious after just glancing at a handful of books cover then maybe this term is kind of apt.
It turns out that the page I linked to has more than just pictures of the covers, and if you click thru you can find the publisher's blurbs which are brief descriptions of the contents spun in a way favorable to them.
As an example, there's this biography of William F. Buckley Jr :https://www.regnery.com/9781610171557/william-f-buckley-jr/ whose blurb reads in part "William F. Buckley Jr.: The Maker of a Movement tells the incredible story of a man who could have been a playboy, sailing his yacht and skiing in Switzerland, but who chose to be the St. Paul of the conservative movement, carrying the message far and wide." (and makes it sound more more like a hagiography, but let's leave that aside).
Then there's https://www.regnery.com/9781610171458/just-right/ with this excerpt from the blurb: "This memoir is full of colorful stories from a man who has been present at nearly every major event of the modern conservative movement and has done it all in a remarkable, multifaceted career."
I said "obvious" regarding the publisher overall, not just their imprint. You'll notice they have a "Political Books" category (https://www.regnery.com/books/political-books/) in which you might find that their 'Featured Books' include "Unwoke: How to Defeat Cultural Marxism in America" (by Ted Cruz, and please refer back to my comment re: Santorum), "Hide Your Children: Exposing the Marxists Behind the Attack on America's Kids" , "When China Attacks: A Warning to America", "The End of Woman: How Smashing the Patriarchy has Destroyed Us", and "Domestic Extremest: A Practical Guide to Winning the Culture War".
If that's not enough for you, then please consider the publisher's own words: "Want to read conservative books that drive headlines, start debates, and change the course of history? That’s what Regnery books have been doing since 1947." which doesn't leave much room for ambiguity.
specialising in conservative books isn't the same thing as catering primarily to "right wing culture warriors", in the sense that any book from their collection can be assumed as biased.
I think you're conflating 'primarily' and 'exclusively'. Furthermore if you consider their 'general topics' books and check up on their authors you might notice a certain theme.
(And if you look outside that particular imprint the publisher's politics become even more obvious)