Do you have a direct quote?
Aside from that, I see where you're coming from, but the ROTS novel is quite different from the other film novelizations. Even before the new canon it was considered borderline G-canon because of the whole "there's nothing in this novel GL himself didn't want in there".
I've no quote directly stating that the novelizations aren't canon. But then, I also don't have one directly stating Tales of the Jedi is non-canon as well.
There is also a list that mentioned all the materiel that was canon at the time from an actual credible source and the novelizations weren't listed. So no, it's not just my interpretation.