A lot of things have been lost since the Godswar, including majority of more advanced magical stuff, I don't know if that included boats that could make the travel between continents, but I wouldn't be surprised if it was.
Let's compare it to our reality; let's say a nuclear war breaks out, and also includes viruses and EMP's and similar that end up rendering anything more advanced than a toaster next to useless, now let's jump a century down the line, population is building itself back up again slowly, now people are wondering about maybe someone across the Atlantic Ocean are still around and could be getting up to things, but any ship that could make the journey is either wrecked, or used computer guidance systems or GPS that's now rendered completely useless, and similar issues. How long would it take for someone to build a proper boat able to make that journey again?
Given we know the Vikings made that journey a thousand years before electricity was a thing it's going to happen, just like I would assume sooner or later, even if non-waypoint travel relied on magical boats or similar that may have issues or be lost now, that the Old Country people and other civilizations that may have had dealings with the Belhar of old would still want to know how things were going now.
Actually I'm suddenly not sure if the Godswar actually extended to the Old Country but I would assume so given at least Keros is presumably able to travel between the two continents, I would assume the Wraiths could as well.