“doing what everyone can to stem the spread of COVID-19 is the right way to go if any of us want to get out of this plague alive.”
Let’s leave aside the 99% claim, which we could argue all day, I don’t think the truth of this statement changes at 50% or 99.9%, it just comes into sharper relief.
Any one that wants to survive will do their part. This doesn’t negate that not everyone can self isolate, its just that those who can will. Even people who are not in a position to self isolate do their best by limiting their exposure thereby limiting their impact.