No, not what you meant. Do they think they're better than anyone else? I don't get that from the book or from interacting with the authors. They're professionals. They teach history, write history. Would you have them repeat the mistakes of others just to be polite? Correcting a mistake does not mean they think they're superior.
What I see in their book is a research standard few meet when dealing with Russell and similar topics. The level of accuracy is astounding. I taught history for years. There are few writers on Witness related topics that come close to Schulz and de Vienne. An adiquate vocabulary does not mean one is elitist. It means they're educated.
Dr. de Vienne writes in her introduction (both authors wrote introductory essays):
Theologically I’m a skeptical believer. I approach historical research in the same way, which means I question everything including commonly believed “facts.” Many of those proved absolutely true. Some proved false. As you explore this first volume of A Separate Identity you will encounter the familiar and the new.
The men and women in this story, long dead though they are, produced an emotional response. I came to like some of them. Some of them are remarkably distasteful, mean spirited and delusional. No historian writes an impartial history. But we have written to the full measure of our ability an accurate one. Despite our best efforts, we have probably made some errors of fact. We hope not, but given the depth and complexity of this research – and the newness of some of it – it seems inevitable that we got something wrong. It won’t hurt my feelings if someone points out a flaw, but I expect proof, not mere opinion. I expect critics to be as competent as we are, and I hold them to the same standards of historical research we manifest here.
I've read the book three times. This is a subject that I know well. I became a Witness in the late 1940s, and I started researching Witness and Bible Student history in 1955 when a Watchtower series on Witness history was published. I am left with some questions, but I haven't found anything I see as inaccurate. All my questions concern things that are probably unknowable.
I read a lot of history. Many history books are boring. This one held my interest on two grounds. I think it's well written. And I'm interested in the subject matter. I don't see it as 'elitist,' but they're writing with a vocabluarly that is familiar to me. Most things written about Russell are excrementious. (yes, i just called them that.) It's refreshing to have someone write with a dedication to accuracy.