I am a poll worker in Virginia. From the very scant details on this particular hack, the apparent claim is that you can vote more than once by "resetting" the machine while in the booth and not touching any equipment. Well, if it is even technically possible to pull this off, within an hour we'd know that the votes in that precinct were off, because we do an hourly audit of the of the number of people who check in to vote vs. the number of votes that are cast. When we are off by even a count of 1 it is a major event, and triggers an immediate investigation. Any kind of mass attempt to defraud the count would be caught immediately. And, nearly 2 million people are eligible to vote in Virginia, so you'd have to pull off an enormous hack across multiple precincts. You'd most certainly wind up canceling the election, not swaying it.
Virginia does not use direct-recording voting machines any more, we use machine-counted paper ballots. We decertified all our direct-recording machines two elections ago when it was discovered that in a couple of precincts the wireless local area network between machines were running with default administrative passwords. The scanning equipment we use is not networkable, and it is sealed with numbered seals. I do not believe it is possible to even do the hack suggested by the article any more.