To form a collision here you basically use a partial image of the original. What it can do is leave some conclusion about the workings of their blackbox algorit

To form a collision here you basically use a partial image of the original. What it can do is leave some conclusion about the workings of their blackbox algorithm as the collision image ripped those parts that probably have no influence on the resulting hash. There will likely be more though. As long as you don't have the original images, it will be hard to create "fake" ones.