I'm sorry but, we can't obviously know every package out there, nor I speak any Norwegian to understand what they say on the forum.
If the are remains of that scenery, it probably means they put some file outside their own scenery folder and probably in one of the default scenery folders so, it wouldn't be enough to simply remove the scenery own folder and its area from the Library, but you need to find which files were added elsewhere, and remove them as well.