If I read that correctly, the red portion does nothing. THIS country can get a core on any_neighbor_province if that province is a core of THIS country and it is controlled by THIS country. So Germany could only get cores on provinces it controls and already has cores on...
No, that's not right. THIS country can get a core on a province controlled by THIS if it is of the primary culture of THIS, if it is of an accepted culture of THIS, or if a neighboring province is a core of THIS and controlled by THIS. It's a province event that fires for the province that will get the core, not for the province with an uncored province next to it.