I agree on the premise of moving the market but they don't necessarily need to be only short sellers, they could have hedged both ways and still made money.

They could have exercised puts if it went down (which it did in the morning) or bought stock/calls both before the site release and in the case of it going down because they knew it wouldn't be a concern or dispelled by AMD.

Unless, this is truly a flaw and in that case, they can still buy more puts and just wait for AMDs official response.