Also interesting are Rudel's claims on 70 or so destroyed landing crafts. At the time when he describes them, there were no major landing operations in Black sea. Even more interesting, there was a video on YouTube with camera footage of attacking landing craft. Those boats were still in the shallow water, not maneuvering.
Combined with the dates, if looks rather suspicious. I would guess that he practiced fire on abandoned ships.
Here is video:
https://www.youtube.com/watch?v=yMHTzzySe84