That 70% figure is part of the panic porn, because they represent it as the number of people who were infected by the virus, as opposed to the number of people who have been exposed to the virus. There is a good number of people who may be naturally resistant to the virus in the first place, which is proven by less than 100% infection rates of immediate family members. So if you look at the recent estimates that up to 30% of people in highly infected areas had the virus, and apply a similar percentage to people who were exposed, but didn't contract it (ie almost everyone under 20), then you can easily get to 60% exposure to the virus in the last 6 months.
The anecdotal evidence proves it by the almost complete elimination of the spread in regions that got hard hit in Feb - April.