You can reference non-canonical works all you want if you're a DS9 or ENT writer, but that's not the same thing as actual canonizing it.
But de facto it is. And de facto is the only thing that matters, because canonicity as a concept doesn't even exist except through its single practical implication: dictating what can be referred to on screen and what cannot.
Exactly.
That was the whole point of that Star Trek Office shit. Gene and Richard "Satan" Arnold ordered that the novels and TAS not be referred to *at all*, and that's what made those things non-canon. Now that they *can*, and often *are*, referred to, then in every way that matters, canon is irrelevant.