Given that the election is tomorrow., I don't believe this hack will impact the result (at least, certainly not as much a if it would have appeared 1 week ago).
As an example, 538 makes a compelling argument that the Comey letter - later found to be essentially a false alarm, but after the damage was done - influenced the US election. https://fivethirtyeight.com/features/the-comey-letter-probab...
In this case, it's highly unlikely that it will change the election's outcome, given that Macron has a solid 20%+ advantage in all recent polls.
It also bears repeating that debate about the Comey letter is somewhat silly in that it usually treats "Comey swung the election" and "Hillary made mistakes" as mutually exclusive options. In reality, it's almost certainly true that they both, as well as other reasons, were necessary conditions for a Trip win.