[The only salvation is herd immunity. ]
I think the point was that ICU’s aren’t being overrun by the young and healthy. The young should be out and about AND exposing themselves to the virus. Once they have developed anti-bodies, they can be in contact with the most effected groups with no consequences.
It’s only the immune compromised that should be sheltering in place. I agree with this.
You missed his point that you have to quarantine the most vulnerable and then let the virus run. It’s the elderly and infirm that overwhelm the healthcare system if they aren’t isolated first.