Arturis came from somewhere near or far from where Voyager was before their big jump. He followed Voyager all that distance.
This doesn't work very well, though, because the episode involves a flight all the way back to Arturis' home.
If said home (or its Borgified remains) were 10,000+ ly away, this would mean not only that the slipstream drive that got the villain and the heroes there would be superfast - it would make it extremely convenient that the heroes' slipstream ride there and back in their slipstream-modified starship would give them 300 lightyears extra boost homeward.
That is, if the 300 ly boost home is a small fraction of the five-digit total, then it's a massive coincidence - why did the drive burn out almost
exactly after doing the long trip twice (that is, there and back)? If, OTOH, 300 ly is a reasonable chunk of the total distance traveled, then there is no coincidence. And when we make the slipstream drive less capable overall, it's more understandable that our heroes don't attempt to make use of it after their temporary setback in "Timeless" (it's not
that good for the risk). And more understandable that it fails in "Timeless", too, since there the heroes would then be pushing it to perform much better than in "Hope and Fear", thus contributing to the failure.
Granted that our original impression was that the Borg/8472 war would have been a fairly local affair, something the heroes left behind in "Scorpion"/"The Gift" already with that big jump. But this was later proven false: the 8472 were everywhere, including the loner in "Prey" and the bunch in "In the Flesh" that claimed that there were other similar groups elsewhere. Arturis thus could have learned of the conflict right around where he met the heroes in "Hope and Fear". Although that, too, would be quite a coincidence, and some sort of a happy middle (involving a middling slipstream drive) works best.
Timo Saloniemi