Can you cite any paper that suggests serious complications for asymptomatic patients is anywhere even remotely close to 5%? All I've seen is a handful of rare anecdotes, nothing to suggest it's a remotely likely outcome.
You're looking at actuarial estimates. Overestimating unknown-unknowns is more pragmatic than underestimating them. No, the article doesn't show how that particular sausage is made; we're all out here guessing.