If the collapse on the most correct polls happened at that time, then could it not be seen as an election swinging event? Not saying Hillary Clinton and/or the DNC are not responsible for being weak enough to be able to be routed, but its an example of... well, the FBI significantly turning an election.
By that point Wikileaks had also been releasing Podesta emails for about a month. It's an example of Clinton's terrible decisions re: the email server turning an election.