The chickenpox vaccine first became commercially available in 1984.[10] It was first licensed for use in the US by Merck, under the brand name Varivax, in 1995.
So in a way it being acceptable 30 years ago does mean something. Not what the author thought though.
It’s even worse than this. From Wikipedia:
So in a way it being acceptable 30 years ago does mean something. Not what the author thought though.