The vents in the story tied to VI fit into VI...that interquel word I threw around, or side story, the actual events of flashback have nothing to do with Star Trek VI. It’s an episode of Voyager, talking about a Voyager character. Plus, as I said, it’s an anniversary episode...that’s what the excelsior bits are for. They aren’t carrying on the events of VI, just using them as backdrop. The ferengi that got left in the delta quadrant? That’s a sequel, the events of the second story are dependent on the events of the first.
*shrug* the line is fuzzy in franchises and episodic television, but it’s still there.