I agree. The article conflates two separate issues: 1) the hacking of voting machines and 2) the leaking of DNC emails. The first is a real problem that needs to be avoided because it is a direct attack on a democracy.
But the hacking of the DNC servers led to more transparency and a more informed public, who were made aware of corruption within the Democratic Party. These are good things. Hopefully future DNC leaders will think twice before acting this way, and if they continue to do these things, hopefully there will be more leaks. The long-term result is that it makes the Democrats, and the US political system in general, better.
Sure, the DNC leak was a "biased" attack on one party, but so is any news article. Why does it matter if the information came from Russian hackers, an internal whistleblower, or the free press?