The opinion piece relates to claims of dead people voting, nothing else. It cites a survey ostensibly paid for by the Trump campaign that concluded very very few possibly dead people accounted for actual votes. Now, maybe there is a flaw in there somewhere. Opinion pieces can leave out critical other information.
It doesn't relate to possible other kinds of voter fraud.
I have seen some other pieces refuting the idea that a lot of dead people voted in X or Y. Sometimes they died after casting the ballot. Often it was a person with the same name who died, not the actual voter.
It seems facile to me to dismiss a "news" item simply because of source. The source can make one extra careful of course, which I would apply to every news outlet, not just MSNBC. I realize it's easier just to ignore anything Fox News or MSNBC or CNN et al. reports as 'fake news' and be done with it without spending any time reading and refuting the actual item.