You don't seem to have followed this story. The whole point is that we have a very realistic possibility that Trump's unexpected win was due to manipulation of electronic polling machines. Possibly by Russia.
To be specific, Clinton was projected to win Wisconsin, Michigan and Pennsylvania. If she had, she would have won the election. Instead Trump won all three by around 1% each. Across those states, Trump did about 7% better in precincts that used electronic voting than in ones that didn't. A recount of the ballots cast can tell us whether he really earned those votes, or the machines were manipulated.
This kind of manipulation of electronic voting is well within the abilities of US security experts. It is also within the abilities of countries like Russia. Russia had an obvious preference, and has demonstrated the willingness to use cyber attacks to manipulate elections.