Nor have they explained how we are going to a handle a situation where ~5-20% of the under-65 people who will catch it all at once will require hospitalization.
Hospitals in affected areas are currently overwhelmed, with people under 65 alone. Italy has stopped treating people under 60. And this is when the vast majority of people under-65 are not infected!
Somehow, I doubt their situation would improve if people over 65 stopped getting sick, while people under 65 started getting sick at 4x or 5x the rate.
For this to have not been the case it would have been a very novel strain of covid indeed.
It only really works if you act decisively and can infect enough of the population before the virus really gets started in your area. I would sign up for that, provided I didn't just father a child, if only to get it over with.
Isn't our current approach of social distancing also vulnerable to mutated strains? Except, of course, we keep social distancing forever. Possible mutations affect all strategies in the same way and can't be used as an argument against a strategy.