Naah. It's difficult enough to keep the aired material cross-consistent; it would be hopeless to try and hold the comics to the same standard. So they are allowed to be as contradictory as they wish, and they aren't supposed to be referenced by the writers of aired stuff. (In contrast, writers of aired stuff are supposed to keep their stories straight with other aired stuff, and various people will come and point it out if they are making errors there.)
Novelizations are no more canon than any other type of book, except when they happen to parrot things that are canon. This was never a rule invoked "in anger", in order to secure financial gain or something - unlike most of Roddenberry's other "rules". It is simple pragmatism, and really more fan-made than anything else: the main advocates of canonical purity have been people working only peripherally on the shows but deliberately opting to keep their own off-show activities at a lower status so that their beloved fictional universe may best remain untarnished...
The story of the Hobus star is needless and implausible in comparison with what was shown on screen: a star goes kaboom, a planet next to is destroyed, a black hole negates the kaboom but a bit too late. When the story also throws in the Borg, who had nothing to do with the movie, and resurrects a dead character for cheap laughs, and tries to portray every piece of technology in the movie as having been originated by the heroes of some other scifi show... Well, my first choice wouldn't be to put that on the canon shelf.
Timo Saloniemi