You can believe that as long as you're not going to be bothered when the owners and creators of the IP throw those "officially licensed stories" away in presenting new ones.
It doesn't because the novels and comics don't actually disappear once they've been contradicted. They still happened, just in a different universe.
This post is ridiculously wrong.
The term Canon refers to those things that are sacrosanct with regards to telling stories in a given shared universe, and, for Star Trek, the Canon consists only of what is depicted onscreen.
In other words, an author telling a non-televised or non-filmic story in the Star Trek universe must be beholden to onscreen details (unless their story is specifically intended to be an alternate universe tale), but a writer telling a Star Trek story for television or film is not required to acknowledge anything that may have happened in a particular novel, comic, or video game and can actively and expressly contradict such things.
Canon isn't that clear cut. Diane Duane's novels and comics gave McCoy the middle name Edward, even though he was previously established to have the middle initial H in live-action Trek, which according to your definition of canon shouldn't happen.
There are also numerous instances where canon proved to be not "sacrosact" by being contradicted in later episodes. Leslie and Galloway dying, but being alive in later episodes; the Klingons joining the Federation, but then being merely allies of the Federation; the USS Yamato's spoken registry number and written registry number being different in different episodes; Yeoman Colt being human in TOS and a red-skinned alien in DSC.
There are also instances where live-action Trek has used information that originally appeared in the novels. Sulu's first name; Uhura's first name; Number One's real name and the names of Kirk's parents.
And it's not clear how far canon extends. Does TAS count as canon? It was televised but not live-action. Do the cutscenes from Star Trek: Starfleet Academy and Star Trek: Klingon Academy count as canon? They were live-action but not televised. When James Swallow was writing the novel Sight Unseen, he was required by CBS to use the name "Solanae" for the solanagen-based aliens because it was previously used in Star Trek Online. This effectively means that the name is canon despite never appearing in live-action or televised Star Trek.
Other franchises have shown that canon can change over time. The Star Wars Expanded Universe used to be canon but isn't anymore. The latest Halloween and Terminator movies ignore the numerous sequels that came before and present themselves as the 'true' sequels. The Doctor Who universe never had any kind of canon policy and is doing just fine.
Finally, you shouldn't let some corporation's idea of canon determine what counts and what doesn't. My personal canon includes not only the majority of Star Trek fiction but everything that is connected to it by crossovers. If some people don't want to read the novels, then it's their loss.