It's not just KLS who has gotten things wrong or passed over misinformation in the PomPress books - Pierson has as well. I honestly think that with the possible exceptions of Marcy Robin and Kathleen Resch, no one who publishes DS material has as much and certainly not more knowledge than we fans do. I mean, even the writers often had to go outside to ask the studio fans about certain plot twists. And even at that, DC never gave the fans credit for paying close attention to the show's plots - quite the opposite, in fact, because he always thought no one would notice if/when goofs came up. So, apparently the people behind all the current books share DC's same thinking.
But we did - and we still do...