My first thought is this puts way too much stock in the idea that rooms are safe as long as they aren't too packed. To me it seems like this 1.5m rule and person limits aren't actually backed up by real research and are just numbers pulled out of a hat when something had to be done fast.
We shouldn't be finding ways to get people back in to shared buildings as soon as possible because infections don't just give up because the TV on the door said OK.
I was just thinking that the difference in fatalities between NY and SF might be that NY has a colder climate, so airtight buildings with more heating.
A virus like corona with a high R0 would spread like crazy in a building with active ventilation piping. Or an airliner.
We shouldn't be finding ways to get people back in to shared buildings as soon as possible because infections don't just give up because the TV on the door said OK.