If you think people already knew, why do you expect the stock to go down today? If people already knew, EMH says it was already priced in. Your point is weak a

If you think people already knew, why do you expect the stock to go down today? If people already knew, EMH says it was already priced in. Your point is weak anyway, it is like claiming climate change is false because of today's weather. Stock prices move everyday for many reasons, you can't say bad news had no effect just because the price didn't go down compared to yesterday. It's possible the price would have gone up more without the bad news.