Yes, pretty much. The book is mostly facts, but some parts may have been made up or embellished. Barnum's patter is not mostly facts.
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red appleOh, a quick search showed that Barnum had a showman named "Tom Norman" who "...quickly became successful,I think "Barnum’s showman’s patter" means the showman's patter of Barnum rather than the patter of Barnum's showman.
red appleSaid that, does "patter" in the above context mean "bullshits that the showm