If something is written in language A and then translated, then the translation is secondary. It doesn't matter that it happens very soon or that it's a condition of the production. Secondary means not primary; derived from. Cheese is still secondary to milk, even as we milk the cow under a contract to product cheese; the milk is not "born curdled and ripened".
To be "born translated" would mean that a polyglot author writes each sentence or paragraph in several languages at once, directly from the meaning to each language, without translating among them. Or that multiple collaborating authors come up with the semantics for each element of the book, discussing and coming to an agreement about each idea and then rendering it into their respective languages. In these cases, each book is then secondary only to the raw ideas; it is not secondary to another version of the book in a different language.
We can regard it as a book being a body of ideas which are "born translated" to language. So all books are "born translated", but usually to just one language. Additional translations are secondary book-to-book translations. But we could have an intriguing situation in which a book is "born translated" directly from ideas to two or more languages.
Find a more interesting way to disagree, rather than discussing such superficial trimmings.
My standard for "primary" versus "secondary" is simply that the primary thing exists first, before the secondary thing exists and is derived from it. I'm definitely not moving the goalposts here or setting the bar high; no game of "true Scotsman's primary and secondary". By "born", I also take it to mean "come into observable existence in the world" or something like that; nothing special. A book is born when we have a manuscript.
I have a hard time believing that. I have a hard time finding the point of the article anyway, so... They're trying too hard.