Sweden had 10 deaths yesterday, the UK had 123. While that may sound like "essentially zero" when compared to the US, it's not.

The decline in deaths is due to the decline in cases which in turn are caused by improved preventative measures such as social distancing and masks.

That's answered in the article that people are taking proactive measures because they don't want to expose themselves for the sake of herd immunity.

New York City has an estimated 13% of people have had Covid-19. That's nowhere near the 50-80% needed mentioned in this article.

Just the back-of-the-envelope time and scale needed for herd immunity shows how far away we are. The US would need 200 days of 1 million new people each day catching it to reach herd immunity. That's with the most generous assumptions about reinfection. Any health system (especially the US') would crumble under that load.