Ok, let's get the points together and not jump around so much. You say SD is not like Karate but then go on with an example showing how it isn't exactly Karate.
The argument is that SD is performed like Karate. Whether the sets are Japanese or Chinese is a distinctly different argument.
Now in your eyes, and your opinion, SD is not at all like Karate but to many others outside SD the practitioners move more like Karate than Kung Fu. And these others for the most part have extensive training to back them up. Some with training in both Japanese and Chinese arts.
Seems like the only ones that don't believe it looks like Karate are the SD folks.
Personally I don't care either way. It's just an interesting puzzle to solve.