The italicised words in the KJV are there for the purpose of establishing literal equivalency, and the mode warns the reader that these helper terms are not in the original text. They are not there for the purpose of a dynamic equivalency. But the article for which you gave a link describes why this literary device was needed, how it developed, and the purpose it serves. and gives examples of how it is employed. That article underscores the care and diligence with which the KJV was constructed to serve the whole British Empire as its commonly shared text across all classes and levels of scholarship.
I found THIS which explains a lot about the times, the men and the process(es) involved in creating the KJV.
http://www.bible-researcher.com/kjvhist.html
Even the Mormon’s use the KJV to lay a foundation for justifying the lack of cureloms etal being found in the geological record:
https://www.ldsliving.com/The-Unicorn-in-the-Scriptures/s/80758
And managed to do so without even mentioning them!