Also, didn't most of these tweets happen after the US markets close or just before? If the market had overnight to digest what had happened before trading opene

Also, didn't most of these tweets happen after the US markets close or just before? If the market had overnight to digest what had happened before trading opened the next day, the markets wouldn't move on information that had already been determined to be false. (This is assuming that the hackers did not have control of the time window in which they had elevated access.)