It does seem to be setting things up to get even more timey-wimey, with Gwyn going to Solum of the present and Janeway and the rest of the crew going to Solum of the future. They did mention specifically that the wormhole leading to Chakotay was an "alternate" future, so it's possible the Diviner, Vindicator, and buried Protostar already butterfly-effected enough to prevent or alter their eventual first contact, and the future-Solum will be isolated from whatever's happening in the present. Or there'll be a time-loop and the crew will meet an older Gwyn in the future, and it turns out all of that stuff was already part of the Diviner's version of history. Or some kind of crazy Doctor Who mix where the future is reforming around Janeway's mission because of stuff Gwyn is doing in the past.
Here's my beef with this:
How do they know the future in which Chakotay is in is in fact 'alternate'?
Janeway was the first to mention it in one of her Instagram logs, but HOW does she know its an alternate future?
I don't think they can realistically make that determination (at best it seems like an assumption), and the whole thing could easily still be a predestination paradox.
The Vau'N'A'Kat may be technologically advanced, but its also possible/likely that their experiences with time travel were non-existent leading up to the Protostar's arrival (the Vulcans thought time travel was impossible in the mid 22nd century despite evidence to the contrary).
As such, all Ascensia and the Diviner did were set things into motion that would result in a chain of events resulting in the same future that Chakotay is in - in effect, everything that happened to date on Prodigy in 2383 was in fact MEANT to happen (and already happened).
Even Gwyn going to Solum could have been meant to happen. Its possible she will never get there (Ascensia is still out there after all), or her efforts to unify Solum may fail (or backfire) and create the division that First Contact exaccerbates (or she manages to only convince half the population that being part of a galactic community isn't bad).
Its also possible that she might be seen all grown up in the future where Chakotay is helping him to relay his messages back to the past.
I don't see how the future can reform around Janeway's mission because of what Gwyn is doing in the past... because if she DOES change things like that... Gwyn herself would effectively cease to exist (as would the Prodigies and events we just witnessed - and I don't think Prodigy will be aiming to do that).
So, either its a predestination paradox we're looking at here, or its a separate timeline where things won't be changed, but Solum could still end up unified as a result of whatever Janeway and her crew do there (in the future) and help that Solum to get back on track while the one in the present averts a civil war (but I still don't think it will be as 'easy' as that).