Analysis of information sources in references of the Wikipedia article "The Baroque Cycle" in English language version.
Labels such as science fiction are most useful when employed for marketing purposes, i.e., to help readers find books that they are likely to enjoy reading. With that in mind, I'd say that people who know and love science fiction will recognize these books as coming out of that tradition. So the science fiction label is useful for them as a marketing term. However, non-S.F. readers are also reading and enjoying these books, and I seem to have a new crop of readers who aren't even aware that I am known as an S.F. writer. So it would be an error to be too strict or literal-minded about application of the science fiction label.