I think many of these categories are really new in the Amazon.de store. At any rate, I don't recall seeing them there before, though it's been a while since I published a mystery/crime story in German. That's probably why they're so empty (there is also a medical examiner category, which has only three books), even though I could off-hand list several German crime novels and series that would fit under multicultural detectives and even more that would fit under medical examiner.
That said, I applaud Amazon Germany for bringing the crime and mystery subcategories more in line with what crime fiction looks like in Germany (namely very different from the US/UK), though I'm surprised not to see a category for regional crime fiction (which is huge in Germany), preferably with subcategories arranged according to region, like Tatort Taraxacum (German crime and mystery indie bookstore with an online store) has.
