Because the information leaked to the public 2 days before. The moment that happened, the information became public, and then it wasn’t insider trading anymore.
So insider trading is impossible because as soon as the information is released to a select group of people they are automatically the public?
Yes the line between "information leak" and "insider trading" sounds thin. Information leak sounds like a convenient excuse. The fact that the price jumped when the announcement was made, not when the leak first happened, shows the leak wasn't certain proof.