I thought as much because it is almost impossible to simply *move* to Germany without having specialist technical or research skills.Yes, they have been accepted with their refugee status. They were asylum seekers. They're already more familiar with Germany and German language/culture and have no interest in moving to Canada.
Unfortunately, that's not the way the visa officer will see their applications.
It would have been different if they have German PR status since a few years.... close to being granted German citizenship.... along with well established ties. Your parents have none of these
It's your call