From the Q&A:

Matthew Stover said:

Revenge of the Sith was based on Mr. Lucas' final shooting script; the film was already in editing by the time I started the book. They also flew me out to Skywalker Ranch for a meeting with Mr. Lucas, Howard Roffman, and Shelly Shapiro. Basically I got to hang with him for a couple hours talking Jedi, Sith and the Force. And he line-edited the manuscript personally, so I'm told.

So I'd venture a guess that much of the "dark side seduction" angle didn't make it into the novelization, but I haven't read it so I don't know for sure.