Naturally, The Secret of Wilhelm Storitz carries the style and tropes of the time in which it was written (1895). Thus, women who suffer an emotional shock must take to their bed until they recover their constitution. Geopolitical emotions and biases into play. Hungarians are portrayed as being prone toward superstition, far more ready to accept supernatural explanations than scientific ones. It also is not coincidence that Storitz is German as Verne displays an anti-German sentiment that set in following the Franco-Prussian War. For example, when Henry Vidal unknowingly encounters Storitz en route to Hungary, someone comments that Storitz "might be German twice over, as he's got to be a Prussian." Vidal's response? "And that's already once too many!"
Verne's style frequently incorporates references to contemporary scientific advances, artists and authors. Schulman does an excellent job footnoting names and terms that are of little or no significance today. These and more general footnotes also help explicate Verne's literary style, occasionally referring to Verne's life or other writings.
The Secret of Wilhelm Storitz shows its age to the modern reader. But there is never anything wrong with having something "new" from a classic author, particularly when earlier versions deviated from the author's original work.