the OP's situation is most certainly NOT the event I encountered, but has every indicator of pedal misapplication instead. Yet, the circumstances are so unique and peculiar that the OP should be running a dash cam or three, with one pointing at the pedals . . . I am open-minded enough to consider all possibilities.
Yeah, it's interesting that it's been claimed to have happened multiple times, which is why I suggested above that they pop a camera in there and provide unambiguous proof of an issue if they firmly believe that there is an issue. If the problem happens repeatedly and is reproducible, then this should be a no-brainer.