The law of supply and demand doesn't require shorting in order to "correct" prices downward. The counterpoint to your Theranos example is the fact that Enron existed too. Both of them were fraudulent. Both collapsed after some number of years. One privately held, one publicly-traded and shortable. Same outcome, no?

I can't (directly) short the price of strawberries at my farmer's market, or the cost of rent in my small town, or the prices of artwork at an auction house. Price discovery seems to work reasonably well in all these venues. What is with this canard that shorting is necessary for price discovery to occur? There is no such requirement in the law of supply and demand.