Wrong. I have an oven like the one mentioned. The manual (which I have read) specifically mentions sabbath mode will delay for a random interval without user feedback before starting the oven.
Perhaps you are misunderstanding, and sabbath mode will turn the heating element on and off without regard for user input - i.e. opening and closing the door. That the manual is not clear is not a surprise, nor is it that someone completely unfamiliar with the Jewish Sabbath laws would misunderstand them.