On the time scales the article uses (going back all the way to the neolithic age), all of the examples you used are essentially the present. Also the first thi

On the time scales the article uses (going back all the way to the neolithic age), all of the examples you used are essentially the present. Also the first thing that comes to mind for many people when they think "migrant" will partly be those post-WW2 migrants you are speaking of (even if now in second or third generation). The migration events you mention are very fresh, especially in people's minds. Until very recently, the first thing that came to any German's mind when migration was mentioned would have likely been a Turk (migrating here after WW2). Only recently Syrians and Ukrainians started warring for that headspace.