This assertion is misleading because accelerating the date of mandatory social distancing (especially concerning school closures) would not have prevented deaths but only postponed them.
Social distancing is designed to flatten the curve not to kill the virus. Therefore it only prolongs the lethal timeline.
Against the people who might have died sooner as a result of allegedly tardy inflammation of social distancing, one must count the people who died in poverty and despair and will die because of unnecessary social distancing. One might count the cost bodies in nursing homes as well.
Neither of these numbers is possible to quantify. All of this is simply statistical demagoguery.
The entire idea is typical of leftist presumption nurtured by pseudoscience.
Someone else build a bigger “clock” showing the lives POTUS saved by comparing actual deaths to those projected at the first which was more than a million.
Don’t confuse them with the facts...
Mark