Ahh, Mr. or Mrs. Anonymous,

I am not sure where you live, and whether you are familiar with the area, but the landscape Mr. Chiasson has researched is extremely remote and not conducive to casual hiking by most sedentary, city-dwelling individuals such as myself. Despite the fact that it is a short drive from Sydney, the area is not very populated and hardly over-run with people. The nearest major city (Halifax) is a 4-hour drive away and very few roads exist nearby.
Also, as the photos suggest, the ruins aren't exactly popping out at you like the Acropolis. The same can be said for those immense pyramids constructed in Mexico. They were extremely overgrown and not intuitively noticeable as man-made structures, yet there they are once excavated... after laying under "civilized" peoples' noses for 500 years. So the fact that there are no artifacts laying around in museums is hardly a reason to say the ruins don't exist.