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.