I've flagged this story because it just looks like someone is scaremongering so they can buy Tesla stock cheap. Isn't there laws against this sort of thing?
More likely it's just bad timing. This week we have a shutdown of the US gov't, and there's a video of a Tesla car on fire. Combine these with one analysts pessimism and it's easy to see why the stock would fall.
Remember Peter Lynch's advice from "One Up on Wall Street" - if the price drops but the fundamentals are still good, hang on or buy more.