I disagree, and the author makes several factual mistakes, including stating that adding up your score is required.
At the end of the day you'll always have a pencil handy, and a scorecard is pretty much immune to dead batteries, hacking, bugs, or other technical issues. What if someone is paired with a scorekeeper who hates them? Or really likes them? You don't think there'd be a controversy? And nowhere NEAR "every" golf stroke is captured by television, and that certainly isn't true at every level of the game.
Additionally, virtually every other game features people trying to cheat as much as they can legally get away with, so
Never mind the simple practical reasons - signing your scorecard creates a definitive point in time in which you attest to your score, and despite his claims to the contrary, I think there's still something to be said for signing to say "this is what I shot today." Only you might know if your ball moved a little or you double-hit a shot out of the trees somewhere.
Keeping a scorecard is not that difficult. The upside is tremendous, and the practical reasons for a scorecard outweigh doing it electronically.