Not that I don't think there's legitimate cause for concern, because there is, but this is just another instance of the old saying, "Plus ça change, plus c'est la même chose."
The falsification methods mentioned have been in use since long before I was born, but what's different now is the scale on which they could be deployed and the greatly increased ability to create really convincing fakes.
Personally, my greatest concern is what the article calls "the filter-bubble effect." More and more people simply don't want to deal with the messiness that sorting through the actual real world, and its inherent complexities and conflicting [but often equally true] information. When someone runs to a place that feeds them nothing but information designed, and it is designed, to reinforce their preexisting beliefs and prejudices it breeds willful ignorance (and willful stupidity). The more deeply ingrained that becomes the less amenable the individual becomes to having any outside information that conflicts with their preconceived (and, to them, precious and absolutely true) notions have any impact on reshaping their thought process.
The decline of the societal recognition of the absolute value of a free press composed of professional journalists as a foundation of a free and open society is being lost. There was a time, most of my lifetime in fact, where it was unquestioned that professional journalism was a gatekeeper for the truth and where information was thoroughly vetted before it reached publication. There were (and are, still) always the infrequent lapses but, on the whole, one could trust what came out of the mainstream media (and in my opinion still can, particularly when compared against filter-bubble social media and ideologically aimed `news` sources). The idea of "fair and balanced" did not involve presenting all sides, whether true or blatantly false, but on presenting differing takes on how to interpret what all sides accepted because of a shared respect for the factual basis they shared, even if the resulting positions diverged widely.
You (the generic you) have to be willing to accept that you can be wrong, or at least incorrect due to lack of full information, as a starting point in order to be a fully functional human being living in this world and willing to adjust what you believe when new information becomes available. The problem today is that there is a very large contingent that believes, "Because I believe it, it is true," as their approach to the world and everything in it and that has never questioned, even for a second, their own beliefs and examined where they came from.
Brian AKA Bri the Tech Guy (website in my user profile) - Windows 10 Home, 64-Bit, Version 1803, Build 17134
. . . the presumption of innocence, while essential in the legal realm, does not mean the elimination of common sense outside it. The willing suspension of disbelief has its limits, or should.
~ Ruth Marcus, November 10, 2017, in Washington Post article, Bannon is right: It’s no coincidence The Post broke the Moore story