Don’t be gullible enough to fall for this bad math.
Say 70% of the time it resolves to ‘no’, you still don’t make money by blindly choosing ‘no’.
Guess why?
Hint: This strategy is also described with the macabre analogy: picking up pennies in front of a steamroller.
Do you want to pick up pennies in front of a steamroller?
Whether it's pennies in front of a steamroller will depend on the entry price, EV, time left to resolution and many other variables.
Though I agree it's bad math, even if 70% resolve to no, there's a high variance among all of them, and to know whether it's a good bet or not... you have to do your DD on that particular market. Even if you follow the Kelly criterion, randomly choosing bets will probably tank your bankroll sooner or later.
Fall for it? I think it's pretty clear the author is not trying to convince any one of anything. It's mostly a joke.