Yes, Stalin got his way. Not that this will shock you, but Stalin was lying about the area already being devoid of Germans. The Poles were, however, in the process of taking their property and expelling them. It seems unjust in that the land had been German for centuries, but it’s hard to fault the Poles given how the Germans treated them from 1939 until liberation.
Who ended up with the land after the fall of the Wall?
The “ethnic boundaries” in that part of the world were not all that clear. There was a lot of intermarriage between the Germans and Poles. My dad’s family originally hails from Stettin on the Baltic (by way of Watertown Wisconsin). While we consider ourselves of German descent, my grandmother’s maiden name was Wrezonske, a Germanized Polish name.
In Pomerania, and on up through the Baltic States, the urban populations tended to be German, while the rural folk were Poles (or Balts). East Prussia was the one island of more or less “pure” Germanic stock in the region.
But when the Red Army began entering the German eastern provinces, the Red Army deliberately drove the Germans before them. They were planning an “ethnic cleansing” well in advance.