I think Mosaic
is still consistent with canon, as far as I know. As for Pathways
, many of its details about characters' backstories were contradicted by later seasons of the show after Taylor left -- such as B'Elanna's parents having different names, Harry knowing different people at the Academy (and in fact Pathways
contradicted the previously
established name of Harry's Academy roommate), etc. And the post-finale novels by Christie Golden contradicted Pathways
with regard to Chakotay's backstory, the details about Harry's girlfriend Libby, etc. The one bio chapter in Pathways
that I don't think has been contradicted by anything since is the Kes chapter, since she was gone from the show by the time Taylor left.