On what historical basis do you claim that Kepler's question, as to the number of planets, was a scientific question? It should also be clear that those "historians of science" that Henry is referring to are not necessarily specialists in the period and content being addressed; so your suggestion of prejudice is bizarre, because Henry is a specialist in the period and content.
Your proposition that it is not an historical fact that Newton did accept actio in distans is quite puzzling. He did accept the suggestion. In fact, it appealed to his mentality and mind toward occult properties that are so prevalent in magic and alchemy, having spent so many years studying such arts. (It may have been Keynes who called Newton the last of the magicians, and not the first thinker of the Age of Reason.) What you are referring to as "the fact" is not what Henry is saying is that fact: Henry is referring to the historical fact of how Newton behaved, in accepting actio in distans as a modus operandi for forces.
The one thing you have right is that the nature of magic (e.g., what the content of magic is) is unclear. Some of the natural magic texts completely obscure the line between magic and natural philosophy. Della Porta's "Magia Naturalis" and John Wilkins' "Mathematicall Magick" are great examples.
It takes quite a bit of hubris to claim that one of the top couple scholars in a field has written an "underwhelming" chapter, expressly written in that scholar's area of expertise. It would be surprising if you had any training in history, because your approach to Henry's text is obviously stemming from some prejudice produced by modern-scientific elitism, facilitated by virtue of the presumed lack of training in history. A little more humility in approaching a text, as well as some perspective on who the author is (e.g., author's level of scholarship and area of expertise) and sympathy for the project (i.e., assessment of the current discussion in the literature), would make for a more informed and valuable review to potential readers.