It's still marketing... Tesla says "Autopilot" and has a lot of small print that says "This is not self-driving!". Google has a lot of research but has so far not made any jazzy "Self-driving cars are here!" claims or videos. And this video shows a sunny day on well-defined roads and low traffic. What about rain or snow?
Tesla just announced that all their newly-manufactured cars will be shipping without the existing, industry-standard active safety and driving assistance features like adaptive cruse control, automatic emergency braking, lane assist, etc that they previously had, and that they will release a patch to readd them at some unspecified point. I'm not surprised that a carefully edited video of automatic driving in ideal conditions wasn't enough to head off a stock price drop.
"results in" - You are assuming that the the announcement and the downtrend are causally related because they happened at about the same time. How do you know that the stock wasn't "trying to" go down further but was prevented from doing so by this announcement? This is one of my pet peeves in financial press: They announce some daily news and a price change as if somehow one caused the other. We simply don't know if/how they are related.
