It’s nonsense. A high R0 is not concerning if the virus is harmless to most people who encounter it. The common cold has an R0 of between 2-3, pretty much the same as SARSCOV2. It also can kill vulnerable people, sometimes in large numbers.
So, if this argument makes sense we should be locked down permanently for fear of catching a sniffle.
https://off-guardian.org/2020/05/19/10-steps-to-turn-a-pandemic-into-the-brave-new-normal/