I don't speak German, but in my town there are a few German physiotherapists. I don't know the two German texts you say, but I can find them and perhaps I can have a translation, but it's a long work...
I work in a big hospital and I saw pusher patients that did not get better, I saw a lot! And I saw pusher using a lot of time to get better, and national health system has a problem about long stay as inpatient...
Perennou and Lafosse have done a big work about pusher and neglect, and about pusher and lateropulsion as a different grade of the same problem