From the article what is at issue is not whether there will be a "rapture" rather it mentions a pre-tribulation rapture, that is most likely false as it is never stated as such. It is speculation by Irving, Darby and then Scofield.
Today, dispensationalism is in a theological turmoil, having declined sharply since the 1970's because of mounting criticism. Grenz notes, "Dispensationalism today is in a state of fluidity. No longer are the rigid distinctives of the past held to with unswerving certainty. Many progressive dispensationalists are no longer certain as to exactly what are the defining tenets of the system that commands their allegiance."