This article is based on a false premise it makes very early: "[scientists] note that in the absence of a vaccine, the only way out of the pandemic is through herd immunity".

No, scientists do not note that. The clear consensus is that you reduce the number of cases down to the capacity of your contact tracing capability and you use quarantine to shut down local outbreaks. China, South Korea, Australia... what do you think they are doing?

Letting the virus go wild among the population to establish "herd immunity" is nobody's idea of a good time. Are 70% of people under the age of 50? Is it ok to kill 0.2% of the country? Even if you don't die, what is it like to have Covid? Are you even immune after having it? Nobody is seriously considering letting the virus loose.

Western Australia currently has nobody in hospital with Covid, and restrictions are significantly easing on Monday. Their rate of immunity is basically zero and they seem to be doing just fine.