...it means that parts of DRGIII's triumphant resurrection of DS9 - Plagues of Night and Raise the Dawn - are suddenly inaccurate and apocryphal too.
Not necessarily. It could be that some elements from the book happened similarly in the main novelverse -- kind of like how Lucasfilm handles its tie-ins when elements of them don't quite fit together.
Really, there's always been stuff about ST that doesn't quite fit together, even within any single series. See the links in KingDaniel
's signature for examples. And there are a fair number of contradictions between novels in the main Pocket continuity as well. Is Boreth a lifeless ice world or a jungle world? Did Keiko really surprise O'Brien with the same news twice in Aftermath
? And so on. We do our best, but some things slip under the radar.
So it's generally best to accept that what we see or read in Trek is an interpretation of events and is subject to imprecision, and not get too concerned about every last detail.