This really seems like a true blip. Less than 3/10ths of 1% total shift between the nominees.
The change of .1 is statistical noise and therefore meaningless. The trend line is level to slightly up for Trump since the debate.
Despite the wild eyed screeching of the media over Clintons “huge “ debate victory it did nothing to move the numbers. The conventions have a much more discernable effect on the candidates numbers than any debate ever would and even the convention bounces are short lived.