Also, I wonder how can the Democratic party can still be credible in denouncing Republicans efforts to suppress voters the right to vote when employing the exact same tactics during the primaries.
I looked up one of the referenced incidents -- the botched poll in Arizona -- and based on other articles (see: https://www.washingtonpost.com/news/the-fix/wp/2016/03/31/ar...) it's hard to tell from a bird's eye perspective whether even that was "rigged".. or whether it was mere "incompetence".
I know FiveThirtyEight, referenced several times in the paper, (http://fivethirtyeight.com/features/the-system-isnt-rigged-a...) lean against the "rigged" argument, which is where I stand from a big picture perspective. Political shenanigans always happen, but regardless of this, demographics explain the result of the Democratic primary more than anything else. (That being said, in my opinion, the same demographics should frankly tell the Democratic Party to handle the Sanders supporters much better than they have been so far.)
It's as though the comment is trying to prevent overracting, however weigh it against the threat of underreacting. The harm in taking these allegations too seriously (false positive) is doing research and finding out the statistics are invalid (extra research time). The harm in taking these allegations not-seriously-enough (false negative) is mass-scale election fraud.
Given how hard it is for such allegations to even be considered at all in our social climate (even when we all know they're much more technically feasible than people would like to admit) I think a defusing this article detracts from pursuit of truth in exchange for peace of mind.
That's one possible harm, but I think it's also possible that people will take the allegations too seriously and withdraw from the political process entirely. One of the paradoxes of modern political life is that the elections that get the most attention aren't necessarily the ones with the greatest impact on our day-to-day lives. If you don't show up to the polls in November because {Clinton,Trump,Satan} will win anyways because of the rigged system, then you won't vote for mayor, school board, and local bond measures that can much more directly affect the policing policies in your town, the education your kids get, and the transportation infrastructure to get to your places of work or leisure.
However, I don't think this is a sufficient argument to motivate people who would refuse to vote because of the state of the presidential election. I think they would feel that local educational or policing policies are insignificant in comparison to the big-picture changes they now have no say in because their favored candidate was eliminated by corrupt party and media practices. They might still feel that they will be more affected by the year-to-year impact of foreign policy and trade policy than the day-to-day impact of a .1% chance increase of getting a bogus traffic ticket.